Trials with DDT on Potatoes, Cabbage, and Squash1

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Abstract
A 3% DDT dust applied to potatoes, to cabbage, and to squash at 10-day intervals at the rate of 50-60 lbs. per acre, gave good control of the potato leafhopper (Empoasca mali), the potato aphid (Macrosiphum solanifolii), the imported cabbage worm (Pieris rapae), and the squash vine borer (Melitta satyriniformis). DDT-treated potato plots gave a 70% larger yield than was obtained from the control plots. A 1% DDT dust was as effective as a 3% DDT dust in the control of the imported cabbage worm and slightly more effective than a 1% rotenone dust. DDT did not cause foliage injury to potato, to cabbage, or to the Hubbard and Buttercup varieties of squash. However, the growth of acorn squash and certain vars. of muskmelon was retarded.

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