Effects of Insecticides on Populations of the Vegetable leafminer and Associated Parasites on Summer Pole Tomatoes1

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Abstract
Studies were conducted to determine the feasibility of using a biotic larvicide or an ovicide as alternatives to methomyl for control of lepidopterous pests on summer plantings of fresh market tomatoes to avoid upsetting populations of Liriomyza sativae Blanchard and its parasites. Significantly higher L. sativae densities were recorded in methomyl-treated plots compared to those which occurred in Dipel® and chlordimeform-treated plots. Diglyphus begini (Ashmead) and Chrysonotomyia (Achrysocharella) punctiventris (Crawford) were adversely affected by methomyl treatments and the latter parasite also was similarly affected by chlordimeform and Dipel-chlordimeform treatments. Significantly higher fruit yields were recorded from methomyl-treated plots as compared to yields from Dipel and chlorpyrifos-treated plots and from an untreated check, although leafminer densities were significantly higher in the methomyl treatment. A pupal survey technique was more sensitive to differences between treatments than leaflet sampling.