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The toxicity of six insecticides (Advantage, Pyramids, Polo, Imidacloprid, Match and Mospilon) on Brevicoryne brassicae (Hemiptera: Aphididae) and its parasitoid, Diaeretiella rapae (Hymenoptera: Braconidae) were evaluated under constant laboratory conditions (25±2 oC; with 65-70% R.H.). All the tested insecticides were lethal against B. brassicae with the passage of time at highest concentration. Maximum mortality was observed in Polo and minimum in Mospilon followed by Advantage, Pyramid, Match and Imidacloprid. All the LC50s were lethal against its parasitoid with maximum mortality at 48 HAT (Hours after treatment) and minimum in all insecticides at 12 hours after treatment. The maximum mortality (100%) were observed at 48 HAT in Polo and Advantage followed by Imidacloprid and Pyramid (93.33%), Match (92.33%) and Mospilon (86.67%). The minimum mortality of D. rapae was recorded at 12 HAT in Mospilon (36.67%) as compared to other insecticides. observed harmful (class IV) but only Mospilon was moderately harmful (class III) to D. rapae. Maximum survival ship of D. rapae was observed in Pyramid after 48 HAT and minimum in Polo. In general, D. rapae exhibited the highest sensitivity to all evaluated insecticides. The insecticide Polo showed maximum and minimum mortality of aphid was observed in Mospilon application. In case of parasitoid mortality, the maximum mortality was observed at LC50 of Polo ® and minimum at Mospilon and trend of parasitoid mortality was that, Polo > Advantage > Match > Pyramid > Imidacloprid > Mospilon.

pure and applied biology

Laboratory evaluation of different insecticides against Brevicoryne brassicae and its parasitoid, Diaeretiella rapae (Hymenoptera: Braconidae: Aphidiinae)