EVALUATION OF SOME NEW INSECTICIDE MOLECULES AND BIO-PESTICIDES ON MAJOR LEPIDOFTERAN PESTS AND THEIR EFFECT ON HONEYBEE POLLINATORS IN SUNFLOWER ECOSYSTEM.
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Date
2008-03-28
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University of Agricultural Sciences GKVK, Banglore
Abstract
The present investigation aimed at evaluation of new insecticide molecules and
biopesticides on Bihar hairy caterpillar, Spilarctia obliqua Walker under laboratory
conditions, management of lepidopteran pest complex and their effect on honeybee
pollinators in sunflower ecosystem.
Indoxacarb 14.5SC (@ 0.015 and 0.0075%), profenophos 50EC (@ 0.05 and
0.025%) and endosulfan 35EC (@ 0.07 and 0.035%) proved to be effective against the
larvae of Spilarctia under laboratory conditions.
Under field conditions, thiodicarb 70 WP at 0.075 per cent, indoxacarb 14.5SC
(0.015%), novaluron lOEC (0.01%) and 1PM module proved to be effective in reducing
the population of semilooper, Thysanoplusia orichalcea. Similarly, spinosad 2.5SC
(0.0025%), novaluron lOEC (0.01%), 1PM module and endosulfan (0.07%) recorded
slightly lower weevil populations, followed by chlorpyriphos 20EC at 0.05 per cent,
indoxacarb 14.5SC at 0.015 per cent and thiodicarb 75 WP at 0.075 per cent.
Bioefficacy of new insecticides and biopesticides on total defoliator population
under field conditions indicated that spinosad (0.0025%), novaluron (0.01%) and IPM
module registered lower population at seven days after first spray. At seven days after
second spray, thiodicarb (0.075%), profenophos (0.05%), chlorpyriphos (0.05%) and
endosulfan (0.07%) proved effective. Likewise, flubendiamide 20WDG (0.004%),
indoxacarb (0.015%) and spinosad (0.0025%) recorded significantly lower population of
Helicoverpa and higher yield, followed by profenophos (0.05%), B. thuringiensis
(5.2X10^ spores/ml) and IPM module. Endosulfan and Profenophos have recorded
highest Cost: Benefit ratio.
Among the different insecticides and bio-pesticides evaluated on honeybee
pollinators under laboratory conditions, endosulfan (0.07 and 0.035%), was found safer
followed by novaluron (0.01 and 0.005%), profenophos (0.05 and 0.025%) and spinosad
(0.0025 and 0.00125%). Whereas, under field conditions, endosulfan (0.07%), B.
thuringiensis at 5.2X10^ spores/ml, IPM module and M. anisopliae (2.2X1 O^conidia/ml)
were found safer to honeybees by recording abundance and good foraging activity on
both Morden and KBSH-44. Apis dorsata and Apis cerana indica were the most
predominant foragers in sunflower ecosystem
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