COMPARATIVE SAFETY OF SELECTED INSECTICIDES TO Distatrix papilionis (Viereck) (BRACONIDAE : HYMENOPTERA), A PARASITOID ON CITRUS BUTTERFLY

P. D. KAMALA JAYANTHI, ABRAHAM VERGHESE

Abstract


In vitro studies were conducted on the comparative safety of some selected  insecticides against Divtatrixpapilianis (Viereck), apotential braconid larval pal'asitoid of Papiliu  spp. The results revealed that lambda-cyhalothrin, chlorpyrifos and malathion showed quick  knock-do\vn effect 1/2 hour after the treatment and recorded 100% mortality \vithin 24 hours after  treatment. Least mortality after 24 hours was recorded with azadirachtin (w/w) 0.15% (I3.33%),  followed by azadirachtin (EC) 0.03% (26.67%) and imidacloprid (32.2O%) treatments. The  residual toxicity tests revealed that lambda~cyhalothrin, chlorpyrifos and malathion \vere highly  toxic even 14 days after spraying whereas, imidacloprid and synthetic neem based formulations  (azadirachtin \v/\v and azadirachtin EC) were completely non-toxic seven clays after spraying. Thus,  these formulations could be included in IPM modules of citrus as they are safe to the indigenous  natural enemy, D. papilionir.


Keywords


Distatrixpapilionis; insecticides; residual toxicity; safety

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