RESIDUAL TOXICITY OF SOME NEW INSECTICIDES TO HONEY BEE, Apis cerana indica F. (Hymenoptera:Apidae).
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Date
39403
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
Some new insecticides belonging to different groups viz., buprofezin
(thiadiazine), novaluron (acylurea compound), indoxacarb (oxadiazine), methomyl,
thiodicarb (carbamates), imidacloprid (neonicotinoid), lambda-cyhalothrin (synthetic
pyrethroid),fenazaquin(quinazoline)and spinosad (actinomycetes toxin) were tested for
their residual toxicity by exposing the workers of Apis cerana indica to treated leaves of
sunflower at different days after treatment for different durations.
The residual toxicity of spray deposits of different insecticides on sunflower
leaves to A. c. indica varied with chemicals.
On the day of application, all the chemicals except novaluron and lambdacyhalothrin
recorded the mean mortality ofmorethan 25 per cent. i.e. imidacloprid,
spinosad and methomyl recorded the higher per cent mortality levels.
Based on the hazard ratio (field recommended dose divided by laboratory LD50
value), the chemicals thiodicarb, buprofezin and methomyl were grouped under
moderately toxic group, while imidacloprid, spinosad, indoxacarb, novaluron, lambdacyhalothrin
and fenazaquin were grouped as non-toxic chemicals.
The contact toxicity test of different insecticides to A. c. indica varied
considerably. Based on the LD50 values thiodicarb was most toxic compound followed by
imidacloprid, indoxacarb, lambda-cyhalothrin, methomyl, spinosad, novaluron and
buprofezin.