Plants with insecticidal activities against four major insect pests in Pakistan.
Flora local to Pakistan was screened for pesticidal activity against insect pests of field crops. Acidified alcohol extracts from flowers and leaves of Aesculus indica caused up to 75% mortality of Saccharicoccus sacchari. Leaf extracts from Schinus molle and leaf and flower extracts from A. indica caused 60-70% mortality of larvae of Scirpophaga incertulas. Azadirachta indica leaf powder fed to Heliothis armigera [Helicoverpa armigera] caused failure of pupation and adult emergence. Addition of Azadirachta indica and Broussonetia papyrifera to artificial diets restricted adult emergence in H. armigera. Similarly, an extended larval period (21 days compared with 14 in the control), delayed pupation and deformed adult formation was caused by treatment with powdered leaves of Azadirachta indica or fruits of Melia azedarach. Significant mortality (60-90%) was observed in adults of Pyrilla perpusilla treated with extracts from leaves of Azadirachta indica, Dryopteris ramosa and Schinus molle.