Residues of malathion and Sevin on certain vegetable crops with special reference to their side effects on the constituents of lettuce leaves

Abstract

Lettuce and tomato plants were sprayed twice with malathion at 1 or 1.5 l/feddan or with Sevin [carbaryl] at 2.0 or 2.5 kg/feddan, at 15-day intervals. Data are presented on leaf residues and their toxicity to larvae of Spodoptera littoralis, assessed at intervals up to 9 days after application, and on the effects on lettuce leaf weight and composition up to 15 days after application.