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FIELD CERTIFICATION FOR COTTON 

By Francis O Karangala

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 INTRODUCTION 

Only registered seed merchant/growersare allowed to produce, process or sellseed in Kenya by KEPHIS requirement forregistration are stipulated in seeds andplant varieties Act Cap 326

Cotton does not fall under schedule II of the Act compulsory Certification i.emandatory certification for cultivars testedin NPT, officially released by the ministerand indexed.Currently the variety HART 89M isundergoing DUS (distinctiveness,uniformity and stability test) 1st yeardone

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F  IELD INSPECTION 

Registered fields must undergo inspection byKEPHIS.Field inspection carried out against prescribedminimum field standards.Previous cropping A field crop mayberegistered under the following conditions.

If certified seed of the same variety has beenproduced during the previous growing season.

If any other plants but cotton have been establishedthereon for seed production or otherwise as anintermediate crop prior to registration

If production practices used that minimize/prevent the viability of volunteer cotton.

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F  IELD INSPECTION STANDARDS 

a) Isolation And Off Types

Seed Category Isolation (M) Off-types allowed per100 Plants (heads)

Breeders seed 800 1

Pre-basic 800 2

Basic 800 2

Certifiedgeneration 1 to 4(C1 C4)

600 5

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 All off types and doubtful plants should berogued before the final inspection isundertaken.

b) NUMBER OF INSPECTIONSWe undertake 2 field inspection.

First inspection at 50% flowering (70 days

after sowing).Second inspection at 50% boll opening(140 days after sowing)

F ield Inspection Standards Cont 

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c) DISEASESBacterial blight Xanthomonas Malvacearum

Fusarium wilt Fusarium oxysporum

There will be zero tolerance for diseases during

2nd

and final inspection.d) WEEDS AND PESTS

Pests

 American boll worm Heliothus armigera

Cotton stainer Dysdercuss sppCotton jasids Empoasa spp

Cotton aphid Aphid Gossypii

F ield Inspection Standards Cont 

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Weeds (also harmful pests), which lowerthe quality of seed cotton to becontrolled adequately before the final

inspection.

F ield Inspection Standards Cont 

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2. HARVESTING 

Picking should ensure the separation of broken pieces of dry plant material from

cottonSisal bags must never be used for seedcotton as sisal fibres can easily becomemixed with lint and that creates ginning

and spinning problems.

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3 . PROCESSING 

This is the removal of the lint from the seedcotton. Ginneries are equipped with eitherthe rotor gins, which are 8 inches (20cm) indiameter or saw gin which are 8 -12in (20-

30cm) in diameter.The purpose of the gins is to allow the lint topass through while preventing the seedcotton.

The presence of fuzz on the seed hinders theginning process.

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4 . LOT INSPECTION 

 A ginned seed lot shall not pass forlabelling or sealing if it contains morethan 10% of grade B cotton

LINT GRADESa)AR Clean and high quality

b)BR Dirty (stained) and low quality

 An official sample of 2Kgs for laboratorytests and post control test is drawn fromeach lot size 2500 kg.

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5  . SEED STANDARD

Germination 70%

Moisture content 14%

Purity 98%

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 PURITY 

Breedersseed

Basic Cert.

% % %

Pure seed 98 98 90

Other crops 0 0.01 0.10

Inert 2 2 2

Noxiousweed

0 0 0

Weedseeds

0 0.01 0.02

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For Mor e Information c ontac t 

Managin g Dir ec tor Ken ya Plant Healt h In spec torat e Servi ceP.O. Box 49592-00100,

Nairobi , GPOKENYATel:254-2-884545, Fax:254-2-882265E-mai l: dir ec tor@kephi s.or g

www.kephi s.or g