On the Biology and Control of Drosophila on Tomatoes for Processing1

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Abstract
[long dash]Observations in tomato fields in New Jersey indicated the presence of Droso-phila melanogaster, D. tripunctata, D. simulans and Scaptomyza adusta and the first named species was the most abundant during the tomato-harvesting season. Largest numbers of eggs were deposited during Sept. in 1952 and 1953 The flies deposited eggs in tomatoes of all stages of ripeness with little or no preference after the tomatoes have once turned color. The flies present at the canning factory were primarily D. melanogaster, with D. busckii the 2d most abundant. Tests were made of the effectiveness of Dyna-fog applications of pyrethrum and allethrin formulations, DDT, and lindane for the control of Drosophila on truckloads of tomatoes. Lindane appeared to offer the most promise. The number of eggs and maggots varied in tomatoes canned from plots treated with different insecticides. Of the materials tested, TDE gave the largest reduction in Drosophila contamination.

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