Chilli thrips, is one of the major insect pest and appears from nursery to till the harvest of the crop.The peak activity of pest is noticed during August and September month. The extent of yield loss varies from 25-50 per cent.
Scirtothrips dorsalis (Hood) Thripidae: Thysanoptera
Adults are slender, yellowish brown, having apically pointed wings and measure about 1mm in length. The female having long narrow wings with the fore margin fringed with long hairs. Nymphs are like adults in shape and straw yellow in colour but are wingless and smaller in size.
Adults lay minute dirty white eggs under the leaf tissues and young shoots. The fecundity rate is 30-40. Incubation period is 4-7 days; larval period is 5-10 days; pre pupal period is 1-2 days; pupal period is 2-3days, and Total life cycle is 15-35 days.
Different stages of thrips
Nature of damage:
Both nymphs and adults suck the sap, asymmetrical mouth parts helps in lacerating the leaf tissue and oozing sap will be sucked.
Upward curling of leaves is the major symptom i.e boat shape structure, elongation of petiole, stunted growth/ burnt appearance, silvery steaks on pods, deformed pods, Reduction in pod size and length.
Plants show stunted growth and Petiole elongation
Submitted by naipagropediaraichur on Mon, 12/03/2012 - 17:21