DDT to Control Potato Insects

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Abstract
In several expts. conducted in widely separated areas in New York State, DDT appeared very promising as a supplement in spray and dust formulas for potato insect control. Regular field equipment was used to apply the pesticides and in most instances only one application was made. For this reason yield records were not obtained. DDT was equal in effectiveness to calcium arsenate for the control of the Colorado potato, beetle. A dust mixture containing 05% active DDT (in Pyrax talc) approached the effectiveness of nicotine vapor fumigation in aphid control. Remarkable control of the potato leafhopper and the potato flea beetle was obtained with DDT in both spray and dust formulas. The populations of these 2 insects were reduced to near zero. One of the most outstanding qualities of DDT was its pronounced residual effectiveness, maintaining its lethal qualities for 10 days or more. DDT was comparable with bordeaux mixture, fixed copper compounds, Fermate, and Dithane.

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