Mortality Responses in Bracon Hebetor (Say) (Braconidae: Hymenoptera) Against Some New Chemistry and Conventional Insecticides Under Laboratory Conditions (original) (raw)

Abstract

Toxicity of some new chemistry and conventional insecticides, at different dose rates recommended for field use against Spodoptera litura, and 10% above and below the recommended dose were determined against the adults of a larval parasitoid, Bracon hebetor (Say). Amongst the conventional insecticides, profenofos (Curacron 50EC), chlorpyrifos (Lorsban 40EC), methomyl (Lannate 40SP) and thiodicarb (Larvin 80DP) were selected, while from the new chemistry insecticides, lufenuron (Match 5EC), abamectin (Agrimec 1.8EC), emamectin benzoate (Proclaim 1.9EC), spinosad (Tracer 24SC), indoxacarb (Steward 15EC) and methoxyfenozide (Runner 24SC) were used. The higher dose rate of chlorpyrifos gave 100% mortality in the test insect after 24 hours of application, while at lower and recommended dose rates 100% mortality was recorded after 36 hours of application. Similarly, 100% mortality was also recorded in the adults treated with higher doses of profenofos, recommended and higher dose rate of methomyl and the higher dose rate of thiodicarb after 36hours of application. Mean while, insecticide treatments with emamectin benzoate, abamectin, spinosad, indoxacarb and methoxyfenozide, at different doses, were ranked slightly harmful to harmful after 48 hours of their application.

Figures (1)

Means Sharing similar letters, do not differ significantly, at 0.05 probability level according to text. Table 1. Percentage mortality in Bracon hebetor after different time intervals of the insecticide applications, under laboratory conditions

Means Sharing similar letters, do not differ significantly, at 0.05 probability level according to text. Table 1. Percentage mortality in Bracon hebetor after different time intervals of the insecticide applications, under laboratory conditions

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