Insect Stage of occurrence Symptoms of damage Infectious Period American Bollworm All stages Larvae feed on leaf. Bore into squares flowers & bolls Active throughout the year Pink Bollworm Crop mid stage to end of the crop Affected flowers do not grow fully show characteristic ro-setting – buds shed Active in August – November Spotted boll worm Boll formation stage Larva bore into terminal shoot of young plant leading to death development of side shots and Branches form damage parts Bore into flower buds and young bolls damage buds flowers & bolls shed Active throughout the year Tobacco caterpillar Throughout the crop period Early instar larvae feed On under surface of leaf Skeletanisation of leaves. Also feed on flowers, buds, flowers calyx squares and bolls. Through out the year White Fly Throughout the crop growth sucking of plant sap by feeding on under surface of leaf – chlorotic spots on leaves drop premature. November – February. Aphids Early growth stages Suck leaf sap curly leaves leaves drop quickly Sticky honey dew and sooty growth on leaves May – November Jassids Mostly seen at seedling stage Some times seen almost throughout the year Insect feed on under surface of leave curling of leaf edges leaf turn red and brown dry up and shed Almost throughout the year. Spider mite Throughout crop growth period Puncture the leaves - feed on sap - leaves turn red and wither and drop Almost throughout the year. Thrips Vegetative stage Nymphs and adults lacerate leaf surface and feed on plant sap upper side of older leaf turn brown and lower side becomes silvery white May to September

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