Management of Major Sucking Insect Pests Infesting Cotton (Gossypium hirsutum L.)
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Date
2020
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Publisher
MPUT, UDAIPUR
Abstract
The present study on “Management of Major Sucking Insect Pests Infesting
Cotton (Gossypium hirsutum L.)” was carried out at Agronomy Farm, Rajasthan
College of Agriculture, Maharana Pratap University of Agriculture and Technology,
Udaipur during kharif, 2019. The population of aphids reached its peak during the 40th
SMW (49.20 aphids/plant). The peak population of jassids (30.25 jassids/plant) and
whiteflies (32.40 whiteflies/plant) was recorded during the 34th SMW and 31st SMW,
respectively. The peak population of thrips (41.60 thrips/plant) was recorded during the
36th SMW. Whereas, the peak population of mealybugs (26.00 mealybugs/10 cm twig)
was recorded during the 37th SMW. The correlation coefficient study reveals that the
population of jassids, aphids, whiteflies, thrips and mealybugs was positively correlated
with mean temperature, relative humidity and total average rainfall, and the population
of these pests was found significantly positive with the relative humidity. The result of
the bio-efficacy of newer insecticides against sucking insect pests showed that all the
treatments were significantly superior over control. Three sprays of imidacloprid 17.8%
SL@125 ml/ha were found most effective against jassids and aphids with the highest
mean reduction found at 5DAS after all three sprays. It was followed by acetamiprid
20% SP @ 100 g/ha. After the first spray, pyriproxyfen 10% EC @ 600 ml/ha proved
to be the most effective against whiteflies at 5 DAS; while, after the subsequent two
sprays, buprofezin25 SC @ 1000 ml/ha caused maximum mean reduction of whitefly
population at 5 DAS. Three sprays of thiamethoxam 25 WG @ 100 g a.i. ha-1was found
most effective against thrips; while clothianidin 50% WDG @ 40 g/ha had the
maximum mean reduction in the population of mealybugs over the rest of the treatments
at 5 days after spray.
Description
Management of Major Sucking Insect Pests Infesting Cotton
Keywords
Citation
Jat S. And Mahla M.K.