Origin of Populations of the Six-Spotted Leafhopper, Macrosteles fascifrons, in Anoka County, Minnesota1

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Abstract
During the years 1958-1962 studies were conducted to determine the origin of populations of the six-spotted leafhopper, Macrosteles fascifrons (Stal) in a 100-squaremile area in Anoka County, Minnesota, Two sources of infestation were found: eggs produced locally, and adults entering from outlying areas, Some eggs laid in the fall overwintered, while those produced in spring and summer had short incubation periods. In 1961 there was evidence of 3 complete generations and a partial fourth. The host plants on which the leafhopper was found to reproduce are listed, It is suggested that dispersal flights are primarily long distance, covering large areas at a time. Local dispersal flights are probably of secondary importance. Leafhoppers originating outside the study area appeared to be more important as initial sources of inoculum than populations produced locally.

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