Field Tests with Various Insecticides for the Control of Lygus Bugs and the Corn Earworm on Lima Beans1

Abstract

In a series of replicated field tests in southern California Against lygus bugs, principally Lygus hesperus (Kngt.) and the corn earworm (Heliothis zea (Boddie)) on lima beans, the best control of lygus bugs was given by dieldrin, toxaphene, endrin, DDT-toxaphene, and DDT (mentioned in order of their effectiveness). In reducing pitting of beans caused by lygus feeding, DDT-toxaphene was the most effective. It also gave the highest yield of dry beans (4 sacks per acre more than the check), followed by dieldrin, endrin, and DDT. Endrin was the most effective material for the combined control of lygus and the corn earworm. Toxaphene, DDT-toxaphene, and DDT alone gave adequate control of both insects and were less costly than endrin. DDT is the least expensive; one application will give good control of lygus bugs if properly applied at the right time, and a second application will reduce corn earworm damage and prevent reinfestation of lygus.