Safety of chlorantraniliprole 18.5 SC to Cotesia plutellae (Kurudjumov) a larval endoparasitoid of Plutella xylostella L.

The safety of chlorantraniliprole, spinosad, and indoxacarb, was tested against Cotesia plutellae (Kurudjumov) a larval endoparasitoid of Plutella xylostella L. under laboratory conditions. Toxicity on C. plutellae adults revealed that chlorantraniliprole 18.5 SC 10 g a.i. ha-1, indoxacarb 14.5 SC 20 g a.i. ha-1, and spinosad 2.5 SC 8.75 g a.i. ha-1 recorded less than 50 per cent mortality and were harmless, whereas, indoxacarb 40 g a.i.ha-1, spinosad 17.5 g a.i.ha-1 and quinalphos 500 g a.i. ha-1, recorded 63.33, 63.33 and 73.33 per cent mortality, respectively and were slightly harmful after 48 hours of exposure. Contact toxicity on pupae and surviving adults revealed that, chlorantraniliprole at 5 and 2.5 g a.i. ha-1, and indoxacarb at 20 g a.i. ha-1 were harmless with less than 50 per cent mortality, whereas chlorantraniliprole at 18.5 SC 10 g a.i.ha-1, indoxacarb at 40 g a.i. ha-1, spinosad at 17.5 and 8.75 g a.i. ha-1 and quinalphos at 500 g a.i. ha-1 recorded mortality in the range of 52.22 to 71.83 per cent and were slightly harmful. Chlorantraniliprole at 5 and 2.5 g a.i.ha1, spinosad at 8.75 g a.i. ha-1, and indoxacarb at 20, 40 g a.i. ha-1, were found to be relatively safe to the C. plutellae with respect to parasitisation.