Toxicity of some insecticides and biopesticides to Diadegma fenestralis Himage and Cotesia plutellae (Kurdyumov), two parasitoids of diamondback moth.

摘要

Adults of D. fenestralis [D. fenestrale] and C. plutellae were transferred into vials containing filter paper soaked in solutions of malathion (0.05%), fenvalerate (0.01%), fipronil (0.007%), cypermethrin (0.015%), Achook [Azadirachta indica extract] (0.3%), and cypermethrin (0.0075%) + Bt [Bacillus thuringiensis] (0.15%). Parasitoid mortality was evaluated after a 6-h exposure period, and after 24- and 48-h post-treatment periods. C. plutellae mortality was highest with malathion (74.44%), followed by fipronil (57.77%), cypermethrin (27.77%), fenvalerate (15.55%), cypermethrin + Bt (14.44%) and Achook (4.44%). Malathion was also the most toxic to D. fenestralis, followed by fipronil, cypermethrin, cypermethrin + Bt, fenvalerate and Achook (94.44, 68.88, 67.77, 25.55, 24.44 and 3.33% mortality, respectively)..