Insecticide Sprays for Control of Insects on Various Vegetable Crops

Abstract

The need to increaserates of currently recommended chemical insecticides for control of lepidopterous and aphid pests of various vegetable crops demands continued evaluations of the more recently developed insecticides. These materials can then be recommended for the control of the pest species in the event that the recommended materials fail to control the insect pests species or other restrictions prevent their use. Experiments were therefore conducted during the spring of 1959, fall, winter, and spring of 1962, and fall and winter of 1963, at Weslaco, Progreso, and Crystal City to evaluate insecticides for control of the cabbage looper, Trichoplusia ni (Hiibn.), and the cabbage aphid, Brevicoryne brassicae (L.), on cabbage, and the corn earworm, Heliothis zea (Boddie), on lettuce and sweet corn. Shorey (1963) stated that Bayer 44646, Monsanto 40273, and Zectran effectively controlled the cabbage looper on cabbage. Shorey & Hall (1963) showed that high dosages of Bacillus thuringiensis var. thuringiensis were promising for cabbage looper control. These authors also showed that corn earworm control was obtained with DDT + toxaphene, malathion, and toxaphene on poled tomatoes. Wolfenbarger & Getzin (1962) showed that carbaryl effectively controlled the corn earworm on lettuce and that the parathion + toxaphene combination, endrin, and B. thuringiensis controlled cabbage looper populations on cabbage.