BP Singh

Detection Techniques jar. Plant Parasitic Nematodes 211TalJle 2.Detection of nematodes on the basis of symptoms inseed or planting materialCropNematodeSymptoms of damageSeedsWheatFaba beanOnion'RicePeanutAnguina tritieiDitylenclttts dipsaciDitylenchus dipsaciApl1elencllOides besseyiAphelenchoides arachidisDitylenchus destructorBulbs, Corms, Rhizomes & TubersBlack, misshapen seed galls.Shrivelled and discolouredseeds, sometimes withnematode wool attached.No distinct symptoms on seed,nematodes emerging fromsoaked seeds examinedmicroscopically:No observable symptoms butthe infested seeds are lighterand nematodes from soakedseeds can be recovered byremoving the seed coatmicroscopically.Shrivelled seeds with darkbrown testas.Seed blemished or unsound,pods and hulls dark coloured.Onion,garlicGingerTurmericBanana, Abacaplantain(Mllsa spp.)Ditylenclms dipsaciMeloidogyne spp.Radopholus similisRadopholus similisRadopholus similisPratylenchus coffeaePratylenchus goodeyiHelicotylenchusmuiticinetu5Internal necrosis or rot of(Allium spp.) sets and cloves,sometimes with nematode wq,6lattached.'Light brown, wa terv areas onsurface, often in Q'onstrictionswith internal necrosis.Small, sunken, watery lesionson surface.Shallow, water-soakedbrownish les10ns and rotting.Purple to c;iark brown necroticlesions thrbughout cortex ofattached roots, and similarlesions in/buter tissues of corm.Purple fu dark brown necroticlesions in periphery of cortexof attached roots.