DDT to Control Potato Aphids

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Abstract
Applications of DDT, in combination with recommended fungicides, were made on commercial acreages of potatoes on Long Island and western New York. The results consistently showed that DDT reduced aphid populations more than any other aphicide, with the exception of nicotine fumigation. However, the data indicate that applications should be made at frequent intervals to check reinfestation and build-up of populations. The residual effectiveness of DDT was not as pronounced in the case of Macrosiphum solanifolii as it was with Myzus persicae. This may be due to a difference in the region of the plant infested by the 2 spp. The results suggest that at least 2 pounds of actual DDT be applied per acre per application and at frequent intervals during the aphid infestation period.

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