POPULATION DYNAMICS OF LEAF ROLLER, Diaphania pulverulentalis (HAMPSON) (LEPIDOPTERA: PYRALIDAE) OF MULBERRY AND ITS SENSITIVITY TO INSECTICIDES WITH VARIED MODES OF ACTION AND THEIR SAFETY TO SILKWORM, Bombyx mori L.
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Date
2019-08-23
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The experiment was carried out in the Department of Sericulture, University of
Agricultural Science, GKVK, and Bengaluru during 2016-2019. The survey on leaf roller
indicated that, the incidence was peak during September 2018 (38.15 %) at Ramanagara
and October 2017 (40.12 %) at Chintamani. The correlation studies revealed that, there
was significantly negative influence of maximum temperature and significantly positive
influence of relative humidity, rain fall and biotic factors on the abundance of leaf roller.
The insecticide emamectin benzoate caused maximum pest reduction (83.00 %) after 9
days of spray under field condition, followed by chlorofenapyr (82.51 %), fipronil (82.34
%), azadirachtin (81.66 %), lambda-cyhalothrin (79.57 %), novaluron (78.46 %) and
profenofos (77.37 %). The bioassay studies indicated that, lambda-cyhalothrin and
emamectin benzoate highly toxic even after 30 days after spray (DAS). However, the
rearing parameters recorded with chlorofenapyr @ 10 DAS, azadirachtin and novaluron
at 25 DAS, profenofos and fipronil at 30 DAS which were on par with dichlorvos and
untreated control. The findings of present study clearly indicated that the insecticide
chlorofenapyr was safe to silkworms even at 10 DAS followed by azadirachtin and
novaluron at 25 days after spraying and profenofos and fipronil at 30 days after spraying.