Quality Seed Production Technology of Self & Cross-Pollinated Crop Varieties | Varietal Development and Maintenance Breeding Notes

Introduction

Overview of Quality Seed Production Technology

Quality seed production involves the multiplication of seeds of improved crop varieties under controlled agronomic, genetic, and regulatory conditions to deliver seeds that are genetically pure, physically clean, physiologically vigorous, and pathologically healthy. The technology differs substantially between self-pollinated (SP) and cross-pollinated (CP) crops in terms of isolation requirements, roguing timing, and seed class permissibility.

This document presents crop-wise quality seed production specifications for all major crop groups in tabular format, covering pollination type, seed class, isolation distances, field standards (off-type tolerance, field inspections), seed standards (genetic purity, physical purity, germination, moisture), and specific production notes.

General Principles

General Principles of Quality Seed Production

Applicable to all crop groups regardless of pollination type

Principle	Self-Pollinated Crops	Cross-Pollinated Crops
Source Seed	Nucleus → Breeder → Foundation → Certified. Each class from immediately preceding class only. No skipping.	Same chain. Parental lines (A, B, R in CMS hybrids) maintained separately by breeder. Hybrid re-synthesised each generation.
Isolation Distance	Minimal (3–10 m) as cross-pollination is rare (<4%). Primarily prevents mechanical admixture.	Large mandatory distances (200–1000+ m) depending on pollen dispersal mechanism (wind > insect). Prevents pollen contamination.
Roguing	Can be done at vegetative, flowering, or pre-harvest stage. Removes off-types, diseased plants, other crop/weed plants.	Must be completed before pollen shed. Post-anthesis roguing is biologically ineffective. Roguing at seedling and pre-anthesis stages is mandatory.
Field Inspection	3 mandatory inspections by SSCA: (1) Seedling, (2) Flowering/heading, (3) Pre-harvest / maturity.	Same 3-stage inspection. Second inspection (at anthesis) is most critical — isolation and pre-anthesis roguing are verified.
Previous Crop	No crop of same species for ≥1–2 years. Volunteer plants from previous crop are a major off-type source.	Same. Especially critical in wind-pollinated crops — volunteer plants may shed pollen before detection.
Equipment Cleanliness	All machinery (seed drills, threshers, harvesters, bags) must be cleaned before use. Mechanical mixture is the #1 purity risk in SP crops.	Same, but pollen contamination risk is equal or greater than mechanical mixture in CP crops.
Seed Testing	Mandatory ISTA-protocol testing for physical purity, germination %, moisture content, and seed health before certification and tagging.	Same. Additional tests may include hybrid purity verification by grow-out test (GOT) or molecular markers (SSR/SNP profiling).
Certified Seed Rule	Certified Seed (CS-I or CS-II where permitted) is never re-multiplied. Chain ends at CS level.	Same absolute rule. F₁ hybrid Certified Seed is biologically un-multiplable (segregates in F₂); OPV Certified Seed must not be re-certified.
Tag Colours	Nucleus: None (internal)  |  Breeder: Golden Yellow  |  Foundation: White  |  Certified: Blue  |  Registered (optional): Purple

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Section A

Cereals & Millets

Wheat · Barley · Paddy (Rice) · Pearl Millet · Sorghum · Maize · Finger Millet (Ragi)

Group Note

Cereals include both self-pollinated (wheat, barley, rice, finger millet) and cross-pollinated (pearl millet, sorghum, maize) species. Self-pollinated cereals primarily face mechanical mixture risk; cross-pollinated millets require strict isolation and pre-anthesis roguing. Hybrid seed production in sorghum, pearl millet, and maize uses CMS (Cytoplasmic Male Sterility) systems requiring maintenance of three parental lines.

Crop	Pollination Type	Seed Classes Permitted	Isolation Distance (m)	Off-type Tolerance	Min. Genetic Purity (%)	Min. Physical Purity (%)	Min. Germination (%)	Max. Moisture (%)	Roguing Stage	Specific Production Technology Notes
WheatTriticum aestivum	Self-pollinated Cleistogamous; <1% natural outcrossing	BS → FS-I → FS-II → CS-I → CS-II	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.8 CS: 99.0	99.0	85	12	Vegetative (tillering) Heading/anthesis Pre-harvest (dough stage)	Nucleus maintained by progeny row / ear-to-row method Clean seed drill mandatory; no residual seed in drill Major off-types: tall/short plants, different maturity, different spike type, loose/bunt smut-infected heads Seed treatment with Carboxin + Thiram (2 g/kg) or Vitavax mandatory for smut/bunt control Separate storage per lot; 50 kg bags with golden/white/blue tag Hill plots used for variety comparison during certification
BarleyHordeum vulgare	Self-pollinated Cleistogamous; <1.5% outcrossing	BS → FS → CS-I → CS-II	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	99.0	85	12	Vegetative (tillering) Heading Pre-harvest	2-row and 6-row types must be kept strictly separate — mixing is a major quality defect Hulled vs. hull-less types: critical to check hulling character of each lot Loose smut (Ustilago nuda) is seed-borne: hot water treatment (50–52°C for 10 min) or systemic fungicide (Carboxin) used Volunteer barley from previous crops is the biggest contamination source; 2-year gap recommended For malting barley seed production, protein content and kernel plumpness specifications apply beyond certification standards
Paddy (Rice)Oryza sativa	Self-pollinated Cleistogamous; 0.2–5% outcrossing	BS → FS → CS-I → CS-II	BS: 3 m FS: 3 m CS: 3 m Hybrid seed: 100 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	98.0	80	13	Vegetative Heading/panicle initiation Milky stage / pre-harvest	Red rice (weedy rice / Oryza sativa f. spontanea) is most critical off-type and weed — rigorous roguing essential; fields with heavy red rice infestation should not be used Flood irrigation in nursery helps drown red rice seedlings before transplanting Rogue at transplanting stage (before panicle initiation), at heading, and at maturity Panicle characters (awn presence/absence, lemma/palea colour, grain shape, ligule, sterility) used for off-type identification Hybrid rice production: A × R line crossing in isolated field (100 m); row ratio 6A:2R or 8A:2R; supplementary pollination by rope/blower; harvest only A-line rows Seed treatment: Thiram 75 WS @ 2 g/kg against seed-borne blast, brown spot, and false smut Moisture at harvest must be ≤13%; drying on clean threshing floor; avoid pavement drying (contamination)
Pearl MilletPennisetum glaucum	Cross-pollinated Protogynous; wind-pollinated; >85% outcrossing	BS → FS → CS-I (OPV/Hybrid)	BS: 1000 m FS: 1000 m CS: 400 m	BS: 0.05% FS: 0.1% CS: 0.2%	BS: 99.9 FS: 99.5 CS: 98.0	97.0	75	12	Seedling (20–25 DAS) Pre-anthesis (critical) Pre-harvest	Protogyny means stigma emerges and is receptive 1–3 days before pollen shed of same plant — high natural outcrossing; isolation is critical Hybrid seed production uses CMS system: A-line (cytoplasmic male sterile) × R-line (restorer). B-line (maintainer) used to multiply A-line separately In hybrid seed production field: A-line (female) : R-line (male) = 4:2 or 6:2 row ratio Roguing of off-type (fertile) plants from A-line rows done before stigma emergence using distinct morphological markers (earhead shape, anthocyanin pigmentation) Downy mildew (Sclerospora graminicola) is major seed-borne disease; only mildew-resistant varieties recommended; Metalaxyl seed treatment (6 g a.i./kg) mandatory Seed yield: 200–400 kg/ha in hybrid seed production field
SorghumSorghum bicolor	Cross-pollinated Protogynous; wind + some self; 5–30% outcrossing	BS → FS → CS-I (OPV/Hybrid)	BS: 400 m FS: 400 m CS: 200 m	BS: 0.05% FS: 0.1% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	12	Seedling / vegetative Pre-anthesis (mandatory) Pre-harvest	Sorghum has variable outcrossing (5–30%); treated as cross-pollinated for seed production purposes Hybrid seed production: A × R row ratio = 4:2. Roguing of off-type plants from A-line rows before panicle exsertion is critical Grain sorghum and sweet sorghum types must be isolated from each other and from Johnson grass (wild relative) Charcoal rot, grain mould, head smut (Sporisorium reilianum) and covered kernel smut are seed-borne — Thiram + Carbendazim (1:1) treatment Shoot fly and midge attack can reduce seed quality; timely sowing to avoid peak pest pressure Seed yield: 800–1000 kg/ha (OPV); 200–400 kg/ha (hybrid, A-line rows only)
MaizeZea mays	Cross-pollinated Monoecious; wind-pollinated; >95% outcrossing	BS → FS → CS-I (OPV/Hybrid/Synthetic)	BS: 400 m FS: 400 m CS: 200 m	BS: 0.05% FS: 0.1% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	90	12	V6–V8 stage (seedling/vegetative) Pre-tasseling (critical — detasselling) Silking / pollination period Pre-harvest	Separation of male (tassel) and female (silks on ear) on same plant; pollen shed lasts 5–8 days; isolation of 400 m from other maize is mandatory Hybrid seed production: Detasselling of female parent rows (A-line or inbred female) before any pollen shed is the most critical operation. Done manually or by machine. Must be 100% complete before silking begins Row ratio for hybrid production: Female : Male = 4:2 or 6:2. Only ear rows (female parent) harvested for hybrid seed OPV nucleus maintained by isolation block method; roguing before tasselling Maize pollen is light (2 μm diameter), wind-carried up to 800 m — isolation of 400 m is minimum; 600–800 m preferred for BS production Major seed-borne diseases: Turcicum leaf blight, maize smut, ear rots — Thiram + Captan seed treatment Seed drying to ≤12% moisture before shelling; mechanical sheller damage causes seed coat injury reducing germination Seed yield: 1500–3000 kg/ha (OPV); 500–1000 kg/ha (hybrid, female rows only)
Finger Millet (Ragi)Eleusine coracana	Self-pollinated Chasmogamous; 2–4% outcrossing	BS → FS → CS-I	BS: 100 m FS: 50 m CS: 25 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	97.0	80	13	Seedling / transplanting Heading (finger differentiation) Pre-harvest	Ragi is largely self-pollinated but has ~2–4% outcrossing; moderate isolation recommended for BS and FS Off-type identification based on: finger number, finger arrangement, grain colour, plant height, days to heading Blast disease (Pyricularia grisea) is the most serious disease of ragi — seed-borne; Thiram or Captan treatment (2 g/kg) recommended Tiny seed (1000-seed weight: 2–3 g) — special grading screens and seed-handling equipment needed Seed rate lower than cereal crops; precise calibration of seed drills required

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Section B

Pulses

Greengram · Blackgram · Cowpea · Pigeonpea · Chickpea · Field Pea · Lentil

Group Note

Most pulses are self-pollinated (greengram, blackgram, chickpea, field pea, lentil) with 1–5% outcrossing. Pigeonpea and cowpea have higher outcrossing rates (10–40%) and require larger isolation distances. Mechanical mixture is the primary purity risk. Seed-borne diseases (mosaic viruses, Sclerotinia, Ascochyta blight) require careful health management. Low multiplication ratios mean more generations are often needed to scale up volumes.

Crop	Pollination Type	Seed Classes Permitted	Isolation Distance (m)	Off-type Tolerance	Min. Genetic Purity (%)	Min. Physical Purity (%)	Min. Germination (%)	Max. Moisture (%)	Roguing Stage	Specific Production Technology Notes
GreengramVigna radiata	Self-pollinated 1–5% outcrossing; cleistogamous to chasmogamous	BS → FS → CS-I	BS: 10 m FS: 5 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	12	Seedling / vegetative Flowering Pre-harvest	Indeterminate growth habit causes staggered maturity — multiple pickings needed; complicates uniform seed quality management Off-type identification: leaf shape (tri-foliate lobe size), stem colour, flower colour (yellow vs. deep yellow), pod colour at maturity, seed coat colour and lustre Yellow mosaic virus (YMV) is seed- and whitefly-transmitted — use only virus-free seed lots; rogue YMV-infected plants before whitefly vectors spread virus Seed health test for Macrophomina phaseolina (charcoal rot), Cercospora leaf spot, and Rhizoctonia bataticola Seed treatment: Thiram + Carbendazim (1:1, 2 g/kg) + Rhizobium inoculant before sowing Harvest when 80% pods turn black/brown to prevent shattering loss
BlackgramVigna mungo	Self-pollinated 2–5% outcrossing	BS → FS → CS-I	BS: 10 m FS: 5 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	12	Vegetative Flowering Pre-harvest	Very similar to greengram in production technology; can easily cross with greengram — keep minimum 10 m between the two species in seed production fields Off-type markers: seed coat colour (black shiny vs. dull black), pod size, plant erectness, leaf morphology Mungbean Yellow Mosaic Virus (MYMV) is critical — same management as greengram (whitefly vector control; roguing) Pod shattering at maturity is higher than greengram — timely harvesting at 70–75% pod maturity; avoid late afternoon harvesting Powdery mildew and leaf crinkle disease (virus) are economically important — use certified disease-free seed only
CowpeaVigna unguiculata	Largely self-pollinated Upto 10% outcrossing; chasmogamous	BS → FS → CS-I	BS: 25 m FS: 10 m CS: 5 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	12	Vegetative Flowering / early podding Pre-harvest	Outcrossing up to 10% requires moderate isolation; bee and other insect pollinators increase crossing rate Off-type markers: vine vs. bush habit, seed coat colour (white, cream, brown, black-eyed), seed size, pod length and colour at maturity Cowpea mosaic virus (CpMV) and cowpea golden mosaic virus (CGMV) are seed- and vector-transmitted — use virus-indexed seed; rogue infected plants Bruchid beetles (Callosobruchus maculatus) are severe in stored cowpea seed — treatment with Malathion dust or hermetic storage essential Dual-purpose varieties (grain + fodder) — for seed production, focus on grain-type selection and avoid fodder-type contamination
PigeonpeaCajanus cajan	Cross-pollinated 10–40% outcrossing; entomophilous	BS → FS → CS-I	BS: 200 m FS: 100 m CS: 50 m	BS: 0.1% FS: 0.2% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	12	Vegetative / early branching Flowering (pre-anthesis in hybrid production) Pod filling / pre-harvest	High outcrossing (up to 40%) by bees and other insects — large isolation distances are essential Off-type identification: seed coat colour pattern, pod colour, days to flowering, plant height (determinate vs. indeterminate), pubescence on pods ICRISAT CMS-based hybrid seed production: A-line planted in 6:2 (♀:♂) rows; insect pollinators or supplementary bee colonies placed to ensure adequate crossing Wilt (Fusarium udum) and sterility mosaic disease (SMD, transmitted by eriophyid mite) are the most serious diseases — use only wilt- and SMD-resistant varieties for seed production; rogue infected plants immediately Harvest 3–4 times as pods mature in succession on indeterminate varieties — prevents mixing of shrivelled/over-mature seeds
ChickpeaCicer arietinum	Self-pollinated Cleistogamous; <1% outcrossing	BS → FS → CS-I	BS: 10 m FS: 5 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	98.0	85	12	Vegetative Flowering Pre-harvest	Desi (small, angular, dark-seeded) and Kabuli (large, round, cream-seeded) types must be strictly isolated from each other — even 3 m is sufficient for pure stands but larger buffers preferred for BS Off-type markers: seed coat colour (brown/black desi vs. cream/beige kabuli), seed size, seed surface (rough vs. smooth), plant type Ascochyta blight (Ascochyta rabiei) is a devastating seed-borne disease — seed treatment with Thiram + Carbendazim (1:1, 2.5 g/kg) mandatory; use only blight-free seed lots Botrytis grey mould in humid conditions — avoid dense canopies; select well-drained fields Rhizobium inoculant application improves N fixation; critical for seed vigour and protein content in seed lots
Field PeaPisum sativum	Self-pollinated Cleistogamous; <1% outcrossing	BS → FS → CS-I	BS: 10 m FS: 5 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	98.0	75	12	Vegetative Flowering Pre-harvest	Distinct seed types: smooth round seeds, wrinkled seeds, marrowfat — must be kept strictly separate; seed shape is easily confused at harvest Powdery mildew, rust, and downy mildew are primary diseases; seed-borne Ascochyta complex requires Thiram seed treatment (2–3 g/kg) Aphid-borne pea enation mosaic virus (PEMV) and bean yellow mosaic virus (BYMV) — use virus-indexed seed; rogue virus-infected plants early Pea weevil (Bruchus pisorum) causes severe storage losses — seed treatment with insecticides or hermetic storage Dwarf and tall types must not be grown adjacent — plant height is a critical DUS descriptor
LentilLens culinaris	Self-pollinated Cleistogamous; <0.5% outcrossing	BS → FS → CS-I	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	98.0	75	12	Vegetative Flowering Pre-harvest	Very small seed (1000-seed weight: 15–50 g); special sieving and grading screens required to remove weed seeds and inert matter to achieve 98% physical purity Tiny vetch seeds (Vicia spp.) are very difficult to separate from lentil seed by grading — fields must be free from vetch; critical for export quality Large-seeded (macrosperma) vs. small-seeded (microsperma) types — strict identity maintenance Ascochyta lens and Stemphylium blight are seed-borne — Thiram treatment essential; use disease-free seed Stem lodging at maturity complicates harvest — use combine harvesters with low cutter bars; harvest at 80–85% pod maturity

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Section C

Oilseeds

Groundnut · Soybean · Sesame · Castor · Sunflower · Safflower · Linseed · Rapeseed & Mustard

Group Note

Oilseeds include both self-pollinated (groundnut, soybean, sesame, linseed) and cross-pollinated (castor, sunflower, safflower, rapeseed/mustard) species. Cross-pollinated oilseeds require large isolation distances. Hybrid seed production is widely practiced in sunflower (CMS), castor (CMS), and mustard (CMS/GSL). Seed moisture management is especially critical for oilseeds as their high lipid content makes them more susceptible to rancidity and seed coat damage during processing.

Crop	Pollination Type	Seed Classes Permitted	Isolation Distance (m)	Off-type Tolerance	Min. Genetic Purity (%)	Min. Physical Purity (%)	Min. Germination (%)	Max. Moisture (%)	Roguing Stage	Specific Production Technology Notes
GroundnutArachis hypogaea	Self-pollinated Cleistogamous; <1% outcrossing; geocarpic	BS → FS → CS-I	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	98.0	70	9	Vegetative Flowering / pegging Pre-harvest (pod maturity)	Seed is a shelled kernel — mechanical damage during decorticating (pod-splitting) critically lowers germination; gentle hand-shelling or specialized shellers at low cylinder speed recommended for seed lots Seeds left in pod (un-shelled) are preferred for storage — store in pod form; shell only just before sowing Off-type markers: kernel skin colour (pink, tan, red, dark), seed size, plant type (bunch/spreading/semi-spreading), pod reticulation, kernel shape Aflatoxin contamination (Aspergillus flavus) is a major safety and quality hazard — use drought-tolerant, aflatoxin-resistant varieties; harvest at optimal maturity; dry quickly to <9% moisture Tikka disease (early and late leaf spot), rust, and bud necrosis virus (TSWV, thrips-borne) are seed-health concerns — Thiram + Carbendazim treatment Seed viability is short (6–8 months at ambient conditions) — cold storage (15°C, 60% RH) essential for carryover seed lots
SoybeanGlycine max	Self-pollinated Cleistogamous; <1% outcrossing	BS → FS → CS-I	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	98.0	70	12	Vegetative (V3–V4) Flowering (R1) Pre-harvest (R7–R8)	Off-type markers: seed coat colour (yellow, black, brown, green, bicoloured), hilum colour (black, buff, imperfect black), plant height, determinate vs. indeterminate habit, pubescence colour Yellow mosaic disease and seed-borne mosaic virus (SMV) — use only SMV-free seed lots; ELISA-tested seed preferred for BS and FS classes Pod shattering is a major harvest loss factor — harvest at 14–16% grain moisture before pods dry completely; avoid late harvesting Seed coat mechanical damage during threshing and processing is common — leads to low germination. Use low-speed cylinder threshers; avoid threshing at <12% moisture Bradyrhizobium inoculant + Thiram + Carbendazim seed treatment improves stand establishment and disease protection Varieties of different maturity groups must not be mixed; maturity group affects canopy closure, irrigation scheduling, and harvesting date
SesameSesamum indicum	Largely self-pollinated 3–5% outcrossing; bee-visited flowers	BS → FS → CS-I	BS: 50 m FS: 25 m CS: 10 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	98.0	70	8	Vegetative Flowering Pre-harvest	Extremely small seed (1000-seed weight: 2–4 g); seeds must be graded on special fine-mesh screens; weed seed contamination (especially small-seeded weeds) is a major physical purity problem Off-type markers: seed coat colour (white, cream, brown, black, grey), capsule shape, dehiscence vs. non-dehiscence character (shatter-resistant vs. conventional), plant height Non-shattering varieties must be clearly identified — conventional varieties must be harvested when lower capsules are mature but before complete dry-down to prevent shattering loss Phyllody disease (MLO/phytoplasma, leafhopper-transmitted) and powdery mildew are major concerns — rogue infected plants; control leafhoppers Phytophthora blight and root rot — well-drained fields essential; avoid waterlogging Very low moisture threshold (8%) for safe storage due to high oil content
CastorRicinus communis	Cross-pollinated Monoecious; wind-pollinated; near 100% cross	BS → FS → CS-I (OPV/Hybrid)	BS: 400 m FS: 400 m CS: 300 m	BS: 0.1% FS: 0.2% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	60	8	Vegetative / early branching Pre-anthesis (pistillate receptivity) Pre-harvest	Castor has female flowers in upper spike and male flowers at base of spike; pollen is wind-dispersed — large isolation mandatory Hybrid seed production: Female parent (pistillate or CMS line) × Male parent (pollen donor). In pistillate lines, rogue any reverting plants (with male flowers) before pollen shed Row arrangement: Female 4 rows : Male 2 rows; harvest female rows for certified hybrid seed Spiny vs. non-spiny capsule character is a major DUS descriptor — must be consistent within seed lot Castor ricin is a highly toxic protein in seeds — handlers must wear protective equipment during processing; seed health protocols include testing for ricin contamination Cercospora leaf spot, Botrytis, and Fusarium wilt are important diseases — seed treatment with Thiram 4 g/kg
SunflowerHelianthus annuus	Cross-pollinated Protandrous; entomophilous (bee); >95% cross	BS → FS → CS-I (OPV/Hybrid)	BS: 1000 m FS: 1000 m CS: 500 m	BS: 0.1% FS: 0.2% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	9	Vegetative (V4–V6) Pre-flowering / bud stage Full bloom / after anthesis Pre-harvest	Protandrous — pollen shed before stigma receptive; promotes outcrossing through bee pollination. Isolation of 1000 m (BS/FS) is critical; even wild Helianthus species can cross Hybrid seed production uses CMS system (PET-1 cytoplasm): A-line (CMS) × R-line (Rf). Beehives (2–4 hives/ha) placed in seed field to ensure pollination Row ratio: A-line 4 : R-line 2 rows. Only A-line rows (without pollen) harvested for hybrid seed Broomrape (Orobanche cumana) is a parasitic weed infesting sunflower roots — do not use fields with Orobanche history; use only Orobanche-resistant varieties for seed production Sclerotinia head rot, downy mildew, and Alternaria leaf blight are major disease concerns — seed treatment with Thiram + Metalaxyl (Apron) at 2–3 g/kg Harvesting at 25–30% moisture followed by mechanical drying to 9% recommended; delayed harvest causes significant bird damage
SafflowerCarthamus tinctorius	Largely cross-pollinated Entomophilous; 50–70% outcrossing	BS → FS → CS-I	BS: 400 m FS: 300 m CS: 200 m	BS: 0.1% FS: 0.2% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	9	Vegetative / branching Flowering (pre-anthesis) Pre-harvest	Spiny vs. spineless varieties — seed production fields must clearly differentiate; spiny types are difficult to rogue safely without protective gloves Floret colour (orange, yellow, white, red) is a primary DUS marker; mixed floret colours indicate contamination Alternaria leaf blight and root rot (Phytophthora) are major disease concerns in safflower — Thiram treatment (2 g/kg) Wild safflower relatives and thistles (Carduus, Cirsium) can cross-pollinate safflower — fields must be weed-free and isolated from related Asteraceae species Honey bees are the primary pollinators — place beehives for enhanced seed set in hybrid/cross-pollinated seed production
Linseed (Flax)Linum usitatissimum	Self-pollinated Cleistogamous; <1% outcrossing	BS → FS → CS-I	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	98.0	80	9	Vegetative Flowering Pre-harvest (brown ripeness)	Fibre flax and oilseed (linseed) types must be grown in separate plots — both are Linum usitatissimum but differ in DUS characters including plant height, branching, and seed size Pasmo disease (Septoria linicola) and rust (Melampsora lini) are seed-borne — Thiram + Captan treatment (3 g/kg); use rust-resistant varieties Seed shattering from ripe capsules — harvesting when 75% capsules turn brown; swathing and windrowing reduces shattering loss Volunteer linseed from previous crop is an important contamination source; 2-year rotation recommended
Rapeseed & MustardBrassica napus / B. juncea / B. rapa	Cross-pollinated Entomophilous + some wind; 20–80% outcrossing by species	BS → FS → CS-I (OPV/Hybrid)	BS: 1000 m FS: 1000 m CS: 400 m Between Brassica spp.: 1000 m	BS: 0.1% FS: 0.2% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	9	Seedling / rosette Pre-bolting (critical) Flowering (pre-anthesis for hybrid production) Pre-harvest (silique colour change)	Multiple Brassica species (B. napus = rapeseed/canola; B. juncea = Indian mustard; B. rapa = turnip mustard; B. nigra = black mustard) must be isolated from each other by 1000 m minimum — they readily interspecific hybridise Further isolation from radish, wild mustard (Sinapis), and other Brassicaceae relatives is required — wild relatives can introduce erucic acid and glucosinolate genes into low-erucic/low-glucosinolate (LEAR/LLGS) varieties Hybrid seed production uses CMS (Polima, Ogura, or Tour cytoplasm) + Rf lines. Bees essential (4–6 hives/ha) for crossing in hybrid production fields White rust (Albugo candida), Alternaria blight, and Sclerotinia stem rot are major seed-borne/seed-transmitted diseases — Thiram + Carbendazim + Iprodione treatment (2–3 g/kg); use disease-indexed seed Self-incompatibility (SI) exists in B. rapa and B. oleracea — important for hybrid production but complicates line maintenance (bud pollination required for SI-based systems) Silique shattering is a critical harvest loss factor; harvest at 30–35% moisture (yellow-green siliques) for minimum shattering

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Section D

Fibre Crops

Cotton · Jute

Group Note

Cotton is largely cross-pollinated (by insects) with 20–50% natural outcrossing and requires significant isolation for seed production. Hybrid cotton seed production is commercially important in India. Jute is largely self-pollinated with low isolation requirements. Both crops have unique seed preparation challenges — cotton seeds are covered with lint/fuzz requiring delinting before precise seed quality testing and planting.

Crop	Pollination Type	Seed Classes Permitted	Isolation Distance (m)	Off-type Tolerance	Min. Genetic Purity (%)	Min. Physical Purity (%)	Min. Germination (%)	Max. Moisture (%)	Roguing Stage	Specific Production Technology Notes
CottonGossypium hirsutum / G. arboreum / G. barbadense / G. herbaceum	Cross-pollinated Entomophilous; 20–50% outcrossing; bee & insects	BS → FS → CS-I (OPV / Hybrid)	BS: 400 m FS: 400 m CS: 200 m Between species: 600 m	BS: 0.1% FS: 0.2% CS: 0.3% Hybrid CS: ≤0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	65	12	Seedling / vegetative Squaring / first flower Flowering (pre-anthesis in hybrid) Boll development / pre-harvest	Four cultivated species (G. hirsutum, G. arboreum, G. barbadense, G. herbaceum) must be isolated from each other and from wild cottons — inter-species hybridisation corrupts fibre quality Hybrid seed production is the dominant system in Indian cotton: emasculation of female parent flower buds on the previous evening; hand-pollination with male parent pollen the following morning; labour-intensive (requires 200–400 skilled workers/ha) CMS-based hybrid seed production being developed for some genotypes to reduce hand-emasculation costs Off-type markers: bract type (normal frego/okra), leaf shape, flower petal colour (cream vs. yellow), gossypol glands, fibre colour (white vs. green/brown coloured cotton), plant growth habit Bt cotton hybrid seed production: GEAC-approved Bt events (Cry1Ac, Cry2Ab) are only in hybrid varieties — seed certification includes mandatory Bt gene testing (ELISA/lateral flow strip) for each certified lot Seed delinting: fuzzy cottonseed (acid delinting with conc. H₂SO₄ at 1:1 v/v for 2–3 min; then wash + dry) improves plantability, germination uniformity, and physical purity Seed treatment with Thiram + Imidacloprid (175 g + 48 g/100 kg seed) for damping off and sucking pest protection All bollworm-resistant traits are proprietary (under licensing by Mahyco/Bioseed/Bayer) — seed production must comply with IP licensing terms
JuteCorchorus olitorius / C. capsularis	Largely self-pollinated Cleistogamous to partly chasmogamous; 2–8% outcrossing	BS → FS → CS-I	BS: 50 m FS: 25 m CS: 10 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	97.0	70	10	Vegetative (early) Flowering Capsule development / pre-harvest	Two species: C. olitorius (Tossa jute, dark green leaves, elongated capsule) and C. capsularis (White jute, light green, rounded capsule) — both must be strictly isolated from each other; they can interspecific hybridise Jute seed production is concentrated in West Bengal and Bihar — dedicated seed production plots in kharif season after paddy nursery areas are cleared Off-type markers: leaf shape, petiole gland colour, stem colour (green vs. red), capsule shape, seed colour Stem rot (Macrophomina), collar rot (Sclerotium rolfsii), and wilt (Fusarium) are seed-borne concerns — Thiram treatment (3 g/kg); well-drained fields Seeds are very small (1000-seed weight: 3–4 g); dense sowing in nursery; transplanting or line sowing for seed production fields Retting and decortication of fibre from main crop field must not contaminate seed production area

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Section E

Forage Crops

Guar · Forage Sorghum · Teosinte · Oats · Berseem · Lucerne (Alfalfa)

Group Note

Forage crops are grown primarily for animal feed — their seeds are produced as a secondary product of the variety maintenance system but must still meet certification standards. Many forage crops (berseem, lucerne, teosinte) are cross-pollinated and require large isolation distances. Lucerne and berseem require insect pollinators (bees) for adequate seed set. Weed seed contamination — especially Cuscuta (dodder), Rumex, and Phalaris — is a critical quality issue for certified forage crop seed.

Crop	Pollination Type	Seed Classes Permitted	Isolation Distance (m)	Off-type Tolerance	Min. Genetic Purity (%)	Min. Physical Purity (%)	Min. Germination (%)	Max. Moisture (%)	Roguing Stage	Specific Production Technology Notes
Guar (Cluster Bean)Cyamopsis tetragonoloba	Self-pollinated Largely cleistogamous; 2–5% outcrossing	BS → FS → CS-I	BS: 25 m FS: 10 m CS: 5 m	BS: 1 in 30 m² FS: 1 in 10 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.5 CS: 98.0	97.0	75	12	Vegetative Flowering Pre-harvest	Dual-purpose crop (forage + gum endosperm for industrial use) — forage types and gum types must be isolated to maintain type purity; gum content is a critical industrial quality parameter Off-type markers: leaf shape, branching pattern, pod cluster arrangement (single vs. bunch), pod colour at maturity, seed coat colour (white, brown, dull) Bacterial blight (Xanthomonas cyamopsidis) and powdery mildew are major diseases; use disease-free seed; Streptocycline + Copper oxychloride foliar spray Harvest when 80% pods are brown/dry; pod shattering is moderate — timely harvesting essential Rhizobium inoculant for guar (Bradyrhizobium sp.) improves N₂ fixation and seed protein
Forage SorghumSorghum bicolor (fodder types)	Cross-pollinated Protogynous; 5–30% outcrossing	BS → FS → CS-I	BS: 400 m FS: 400 m CS: 200 m From grain sorghum: 400 m	BS: 0.05% FS: 0.1% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	98.0	75	12	Seedling / vegetative Pre-anthesis (critical) Pre-harvest	Must be strictly isolated from grain sorghum varieties and from Johnson grass (Sorghum halepense) — Johnson grass pollen contamination is critical for variety purity High dhurrin (HCN-producing glucoside) content varieties must be identified and segregated — prussic acid (HCN) toxicity in young forage is a livestock safety concern Forage sorghum includes sweet sorghum (high sugar stem), forage-type Sudan grass, and sorghum-Sudan hybrids — each class must be maintained separately with appropriate isolation Multi-cut forage types: allow only the last cut to head for seed production; remove the seed-production panicles of all earlier flushes to avoid mixed-maturity seed Seed health management same as grain sorghum: Thiram + Carbendazim
TeosinteZea mays ssp. mexicana / Euchlaena mexicana	Cross-pollinated Monoecious; wind-pollinated; near 100% cross	BS → FS → CS-I	BS: 400 m FS: 400 m CS: 200 m From maize: 600 m	BS: 0.1% FS: 0.2% CS: 0.3%	BS: 99.9 FS: 99.5 CS: 98.0	97.0	75	12	Vegetative Pre-tasseling Seed development / pre-harvest	Teosinte is the wild progenitor of maize and readily hybridises with maize — very large isolation from maize (≥600 m) is mandatory to prevent contamination in either direction Hard, stony fruits (seeds enclosed in extremely hard glume) make mechanical threshing difficult — modified threshers or hand-threshing required Limited seed certification infrastructure exists for teosinte in India; most seed production is through institutional blocks maintained by state AUs Extremely high tillering and multi-cut ability — seed production management is similar to forage sorghum; only final harvest used for seed Nematode (root-knot, Meloidogyne) susceptibility — use healthy fields with no nematode history
OatsAvena sativa	Self-pollinated Cleistogamous; <1% outcrossing	BS → FS → CS-I	BS: 3 m FS: 3 m CS: 3 m	BS: 1 in 30 m² FS: 1 in 30 m² CS: 1 in 10 m²	BS: 99.9 FS: 99.7 CS: 99.0	97.0	80	13	Vegetative (tillering) Heading Pre-harvest (dough stage)	Self-pollinated cereal; production technology closely parallels barley and wheat; minimal isolation needed Wild oats (Avena fatua, A. sterilis) are notorious weeds — field must be completely free from wild oat infestation; even one wild oat seed in a seed lot is a critical defect. Fields with wild oat history must not be used for oat seed production Naked vs. hulled oat types — strict identity maintenance; hulled seeds cannot be mixed with naked types Crown rust (Puccinia coronata) and stem rust are primary disease concerns; seed treatment with Thiram or Carboxin Dual-purpose (forage + grain) varieties are most common in India; for seed production, allow plants to head out fully — do not cut as forage before seed set
Berseem (Egyptian Clover)Trifolium alexandrinum	Cross-pollinated Entomophilous; near 100% cross; self-incompatible	BS → FS → CS-I	BS: 300 m FS: 200 m CS: 100 m	BS: 0.1% FS: 0.2% CS: 0.5%	BS: 99.9 FS: 99.5 CS: 98.0	97.0	75	12	Vegetative / rosette Pre-flowering (remove off-types) Flower head development Seed maturity / pre-harvest	Self-incompatible — bees essential for seed set. 4–6 strong beehives per hectare placed at crop edge during full bloom; absence of bees = near-zero seed set Cut only 2–3 times for forage before allowing the final growth flush to flower and set seed — this maintains adequate plant vigour for seed production Off-type markers: leaf spot pattern (white horseshoe mark typical of berseem), flower colour, leaflet shape, stem hollow vs. solid, stem colour Dodder (Cuscuta campestris) is an obligate parasitic weed on berseem — use only dodder-free certified seed; infested fields should not be used for seed production. Dodder seeds are very difficult to separate from berseem seeds mechanically Seed shattering from ripe heads is rapid — harvest at 70–75% head maturity; windrow/swath before complete drying Rhizobium trifolii inoculant improves N₂ fixation and seed protein quality
Lucerne (Alfalfa)Medicago sativa	Cross-pollinated Entomophilous (tripping required); near 100% cross; self-incompatible	BS → FS → CS-I	BS: 500 m FS: 300 m CS: 200 m	BS: 0.1% FS: 0.2% CS: 0.5%	BS: 99.9 FS: 99.5 CS: 98.0	97.0	60	12	Vegetative / crown establishment Pre-bloom (remove off-types) Full bloom (bee tripping critical) Pod ripening / pre-harvest	Lucerne flowers require tripping — explosive release of pollen from the keel by bees or other tripping insects striking the flower; without tripping, self-fertilisation does not occur and seed set is near zero Honeybees, alkali bees, and leafcutting bees are effective trippers — 8–10 strong honeybee hives per hectare; early morning placement when flowers freshly open Cut 3–4 times for forage before allowing the 5th–6th growth flush to flower and set seed in the 2nd or 3rd year of stand Off-type markers: flower colour (purple, yellow, white, variegated), leaf shape (leaflet width, serration), pod coil number (1–5 coils per pod), dormancy class (winter-dormant vs. non-dormant) Dodder (Cuscuta) and bur clover (Medicago polymorpha) are critical weed contaminants — virtually impossible to separate their seeds from lucerne seed by routine grading; use only dodder-free certified seed lots Alfalfa mosaic virus (AMV) is seed-transmitted — use ELISA-tested seed for BS production; avoid infected fields Seed yield: 200–400 kg/ha; harvested in coiled/spiralled pod stage before pods completely shatter open Scarification of hard seed (15–20% hard seed is normal) needed for uniform germination — mechanical scarifier or hot water scarification (56°C, 30 min) before sowing

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Section F — Summary

Quick-Reference Summary: All Crops at a Glance

Crop	Group	Pollination	Max Isolation (BS, m)	Min. Germination (%)	Max. Moisture (%)	Critical Production Challenge
Wheat	Cereal	SP	3	85	12	Mechanical mixture; smut/bunt diseases
Barley	Cereal	SP	3	85	12	2-row/6-row type separation; loose smut
Paddy (Rice)	Cereal	SP	3 (OPV) 100 (Hybrid)	80	13	Red rice contamination; hybrid CMS management
Pearl Millet	Cereal	CP	1000	75	12	Protogyny; CMS hybrid system; downy mildew
Sorghum	Cereal	CP	400	75	12	Variable outcrossing; grain mould; CMS hybrids
Maize	Cereal	CP	400	90	12	Detasselling; wind pollen travel; moisture at harvest
Finger Millet (Ragi)	Cereal	SP	100	80	13	Tiny seed; blast disease; 2–4% outcrossing
Greengram	Pulse	SP	10	75	12	Yellow mosaic virus; indeterminate harvest
Blackgram	Pulse	SP	10	75	12	MYMV; pod shattering; isolation from greengram
Cowpea	Pulse	SP	25	75	12	Bruchid infestation; virus diseases; varied seed coat
Pigeonpea	Pulse	CP	200	75	12	High outcrossing; wilt; sterility mosaic; indeterminate
Chickpea	Pulse	SP	10	85	12	Ascochyta blight; Desi/Kabuli type separation
Field Pea	Pulse	SP	10	75	12	Pea weevil; virus diseases; seed type confusion
Lentil	Pulse	SP	3	75	12	Tiny seed; vetch contamination; lodging
Groundnut	Oilseed	SP	3	70	9	Seed mechanical damage; aflatoxin; short viability
Soybean	Oilseed	SP	3	70	12	Seed coat damage; pod shattering; SMV virus
Sesame	Oilseed	SP	50	70	8	Tiny seed; capsule shattering; weed contamination
Castor	Oilseed	CP	400	60	8	Wind pollination; ricin safety; CMS hybrid system
Sunflower	Oilseed	CP	1000	75	9	CMS hybrid; bee pollination; broomrape; Sclerotinia
Safflower	Oilseed	CP	400	75	9	Spiny types; Asteraceae isolation; Alternaria
Linseed	Oilseed	SP	3	80	9	Fibre vs. oil type separation; capsule shattering
Rapeseed/Mustard	Oilseed	CP	1000	75	9	Multi-species isolation; quality gene integrity; SI
Cotton	Fibre	CP	400	65	12	Hand emasculation; delinting; Bt gene verification
Jute	Fibre	SP	50	70	10	Tiny seed; inter-species isolation; stem rot
Guar	Forage	SP	25	75	12	Gum/forage type separation; bacterial blight
Forage Sorghum	Forage	CP	400	75	12	Johnson grass isolation; HCN toxicity; grain sorghum isolation
Teosinte	Forage	CP	400	75	12	Maize isolation (600 m); stony glumes; threshing difficulty
Oats	Forage	SP	3	80	13	Wild oat contamination; hulled/naked type separation
Berseem	Forage	CP	300	75	12	Bee dependence; Cuscuta weed; head shattering
Lucerne	Forage	CP	500	60	12	Tripping mechanism; bee dependence; Cuscuta; hard seed

Key Abbreviations

SP = Self-Pollinated  |  CP = Cross-Pollinated  |  BS = Breeder Seed  |  FS = Foundation Seed  |  CS = Certified Seed  |  CMS = Cytoplasmic Male Sterility  |  SSCA = State Seed Certification Agency  |  DAS = Days After Sowing  |  HCN = Hydrogen Cyanide  |  ELISA = Enzyme-Linked Immunosorbent Assay  |  GOT = Grow-Out Test  |  SI = Self-Incompatibility  |  TSW = Thousand Seed Weight  |  YMV/MYMV = Yellow/Mung Bean Yellow Mosaic Virus