ENTO 331 :: Lecture 10 :: Pest of Cotton

PESTS OF COTTON :: Major Pests :: Thrips

3. Thrips: Thrips tabaci (Thripidae: Thysanoptera)

Damage symptoms: Both nymph and adult lacerate the tissue and suck the sap from the upper and lower surface of leaves and in cases of severe infestation they curl up and become crumbled. Silvery sheen on the lower surface can be seen in early stages of attack.


Upward Curling

ETL: 1 No. /leaf

Bionomics: Adults small, slender, yellowish to brown with fringed wings and drift away on disturbance. Nymph very minute, slender, yellowish and microscopic.

Management

Monitor the nymphs and adults from the 14th day after sowing.
Spray any of the following insecticides with 500 L water/ha

Buprofezin 25 SC 1000 ml	Profenofos 50 EC 1000 ml
Diafenthiuron 50 WP 600 g	Thiacloprid 21.7 SC 100-125 ml
Fipronil 5 SC 1.5-2.0 L	Thiamethoxam 70 WS 430 g
Imidacloprid 70 WG 30-35 g or 48 FS 500-900 ml (or) 70 WS 500-1000 g or 30.5 SC 60-75 ml or 17.8 SL 100 -125 ml	Lambda cyhalothrin 2.5 EC or 600-1000 or 5 EC 300-500 ml
Methyl demeton 25 EC 500 ml	Dimethoate 30 EC 500 ml.