Toxicity of Some Insect Growth Regulator and Neonicotinoid
Insecticides to Cotton Mealybug Predator,
Cheilomenes sexmaculata
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Author:Neetan and Naveen Aggarwal
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:99, Issue:jan-mar
DOI: https://doi.org/10.29321/MAJ.10.100027
Abstract
The toxicity of insect growth regulators and neonicotinoid-based insecticides recommended
for the management of cotton mealy bug, Phenacoccus solenopsis Tinsley were compared
and tested for their toxicity against different developmental stages of predatory coccinellid
Cheilomenes sexmaculata (Fabricius). Buprofezin recorded significantly higher (76.66%)
hatching of eggs of C. sexmaculata, followed by endosulfan (73.33%), imidacloprid (70.00%)
and chlorpyriphos (63.33%). The cumulative mortality of second instar grubs and adults were
found to be highest in clothianidin, profenophos, imidacloprid, chlorpyriphos, acephate and
thiodicarb. The emergence of adults from the treated pupae was highest in buprofezin (83.33%),
endosulfan (76.67%) and profenophos (53.33%). Buprofezin was found to be the safest
insecticide, followed by endosulfan to all the stages of C. sexmaculata and pupae were found
to be resistant to the insecticides as compared to the eggs.
Key words : Cheilomenes sexmaculata, cotton, toxicity, buprofezin.