Leafhopper: Amrasca devastans (Cicadellidae: Hemiptera) || KHETI KA HISAB ||

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Leafhopper: Amrasca devastans (Cicadellidae: Hemiptera)

Distribution and status: a serious pest throughout India's cotton-growing regions

Host range: Cotton, potatoes, brinjals, castor, bhendi, tomatoes, hollyhocks, and sunflowers.

Damage symptoms: Both nymphs and adults ingest the sap from the underside of leaves, causing fragile leaves to become yellow, curl downward at the margins, and become reddened. When there is a strong infestation, the leaves turn a classic "hopper burn" colour of bronze or brick red. crops grow more slowly.

ETL: 25 percent of the field's plants have 50 nymphs or adults for every 50 leaves, or their middle to upper portions are fading and curling.

Bionomics: Eggs are laid singly within leaf veins by adult green, wedge-shaped insects. 4- to 11-day incubation period. On the underside of leaves, a translucent, light-green nymph can be seen in between the veins. Nymphal stage lasts 7–21 days. Nymphs undergo five moults. The life cycle lasts between 15 to 46 days. There are known to be eleven generations per year.

Management

a.     Cotton pest infestation is decreased by early sowing and close spacing, particularly during periods of heavy rainfall.

b.     Set up a light trap to draw in and destroy leaf hoppers while keeping an eye on their broods.

c.      Chrysopa carnea, a predator, should be released.

d.     Spray 1000 ml/ha of monocrotophos 36 WSC and 25 kg/ha of NSKE 5 percent or 750 ml/ha of endosulfan 35 EC per hectare.

e.      Adaptable varieties such as MCU 3, MCU 5, and MCU 9 are best.

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