Mites on Soybeans in Delaware

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Abstract
In a systematic statewide survey of soybean fields during the years 1958-60, three species of phytophagous mites were collected, but only one, Tetranychus atlanticus McGregor, the strawberry spider mite, was found frequently enough to be considered an economic pest. The others were Tetranychus lobosus Boudreaux and Panonychus sp. In 1960, 26% of all leaves collected were infested with spider mites. T. lobosus was present on only 2% of the leaves and Panonychus sp. on only one leaf. Other mites encountered were a predaceous Typhlodromus sp., and a possibly predaceous Balaustium sp., as well as Pronematus sp., Tyrophagus sp., Tarso-nemus sp., and Sejus sp., all of which may be saprophagous. Efforts to relate fluctuations in T. atlanticus populations to rainfall gave inconclusive results.

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