Abstract
The first discovery of a population of the spotted alfalfa aphid, Therioaphis maculata (Buckton), in Wisconsin was made by R. L. Pienkowski in Rock County on October 13, 1956 (Plant Pest Control Div. 1956). Later that year (Nov. 7 and 8), specimens were collected from scattered locations in the southern part of the State. Fields in Rock, Green, Lafayette, Grant, Iowa, Sauk, Dane, Crawford, Vernon, LaCrosse, Trempealeau, and Buffalo Counties were infested. Miss Louise M. Russell of the U. S. Department of Agriculture, confirmed the identifications and noted that the specimens of T. maculata contained no sexual forms. Specimens of the sweetclover aphid, Therioaphis rhiemi (Borner), and the yellow clover aphid, Therioaphis trifolii (Monell), collected on the same date from sweet and red clover, respectively, and submitted to the U. S. National Museum contained oviparous females. Attempts to recover the spotted alfalfa aphid the following year were fruitless, and it was concluded that establishment in Wisconsin had failed.
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