Relative safety of some plant extracts on the parasitization and emergence of Trichogramma japonicum Ash mead

摘要

An in vitro study was carried out to assess the safety of four different plant extracts viz., Melia azedarach, Annona sqnamosa Linn., Nerium indicum Mill, and Citrus sinensis Linn, on the parasitization of the hymenopteran egg parasitoid. The parasitism percentage of the parasitoid was affected by all the plant extracts but at lower rate as compared to the chemical insecticides. The adult emergence was reduced to 37.00 to 66.00% when sprayed before parasitization as compared to 53.67 to 74.67% emergence when sprayed after parasitization. Citrus sinensis revealed contrasting results with 37.00 and 61.67% adult emergence in pre- and post-parasitism treatments, respectively, Quinalphos 25 EC was found to be the most toxic recording only 0.67 to 2 33% adult emergence.