AUTHOR(S)
S. Uma1, S. Jacob2 and K. R. Lyla3

ABSTRACT

 

 Eighteeninsecticides belonging to conventional and novel chemical classes wereevaluated for their toxic effects on the hymenopteran egg parasitoid Trichogrammajaponicum Ashmead following the protocols recommended by InternationalOrganization for Biological Control (IOBC) in the Toxicology laboratory atCollege of Horticulture, Kerala Agricultural University during 2012-13.Commonly used conventional insecticides comprising six organophoshates(acephate 75 SP, chlorpyriphos 20 EC, dichlorvos 76 EC, dimethoate 30 EC,malathion 50 EC and quinalphos 25 EC); one carbamate (carbaryl 5 DP); onesynthetic pyrethroid (fenvalerate 20 EC) and ten novel insecticides viz;acetamiprid 20 SP, emmamectin benzoate 5 SG, fipronil 80 WG, imidachloprid 200SL, indoxacarb 14.5 SC, buprofezin 25 SC, chlorantraniliprole 18.5 SC,flubendiamide 480 SC, spinosad 2.5 SC and thiamethoxam 25 WDG at fieldrecommended concentrations were tested for their acute contact toxicity againstT. japonicum by adopting residual film bioassay method. The toxicity ofinsecticides was manifested as lethal effect on the adult parasitoids. Amongthe eighteen insecticides tested, acephate caused the highest mortality of88.75 % and chlorantraniliprole caused the lowest mortality (21.25 %) to theadults of T. japonicum. Novel insecticides viz., emmemectinbenzoate, fipronil, imidachloprid, indoxacarb, buprofezin andchlorantraniliprole were rated as ‘harmless’ as per IOBC safety classificationwhereas spinosad, thiamethoxam and flubendiamide were found ‘slightly harmful’to T. japonicum. Conventional organophosphates viz., acephate,chlorpyriphos and dichlorvos were ‘moderately harmful’. Dimethoate, malathion,quinalphos carbaryl, fenvalerate and acetamiprid caused a mortality of 30 – 79% leading them to be rated as ‘slightly harmful’ to adults of T. japonicum.

DOI
https://doi.org/10.57182/jbiopestic.7.0.133-136

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