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Identification:
These are very minute insects with slander shape bodies. Adults have clear wings with slight hairiness.
Biology:
Female lays 50 or more eggs, which hatch in 4 to 9 days. Nymphs possess 4 moulting and pupate for 1 week. Pupation takes place in the soil. This stage lasts for 2-4 days. Adult has the life span of 2 to 4 weeks. They have 5 to 8 generations per year.
Damage:
Thrips feed on leaves and buds and also cause symptom of leaf deformation. Heavily infested seedlings appeared distorted. Cool season in June may cause severity in attack due to thrips especially on tip portions and squares. Leaves may show silvery appearance and become cup shaped in appearance. Heavy infestation may cause up to 37.6% loss of yield.
Cultural control:
Thrips hibernates in plant debris, cultivated or cultured soil, tree depressions and on perennial weeds. In early sown cotton its appearance in April causes prominent yield loss. Destruction of alternate host plant is also a good cultural practice for effective management of thrips.
Chemical control:
Thrips ETL is 8 to 10 adults or nymphs per leaf. The important pesticides for the effective control of thrips are Profenofos + Cypermethrin 440 EC (1500 ml/ha), Deltamethrin + Triazophos 360 EC (1200 ml/ha), Lambda cyhalothrin 2.5 EC (800 ml/ha), Profenofos 500 EC (2000 ml/ha), Thiamethoxam 25 WG (60 g/ha), Diafenthiuron 500 SC (500 ml/ha). In addition, Acephate at the rate of 7.5 oz/ha is regarded as comparatively safer and suitable insecticides against this pest.
Treatment / علاج
Chemical control:
Thrips ETL is 8 to 10 adults or nymphs per leaf. The important pesticides for the effective control of thrips are Profenofos + Cypermethrin 440 EC (1500 ml/ha), Deltamethrin + Triazophos 360 EC (1200 ml/ha), Lambda cyhalothrin 2.5 EC (800 ml/ha), Profenofos 500 EC (2000 ml/ha), Thiamethoxam 25 WG (60 g/ha), Diafenthiuron 500 SC (500 ml/ha). In addition, Acephate at the rate of 7.5 oz/ha is regarded as comparatively safer and suitable insecticides against this pest.
