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Leafhoppers; Aphidiidae; Insects--Dispersal--Climatic factors


Two species of leafhoppers and four species of cereal aphids appear to be transported to Minnesota each spring on strong winds from the south or southwest. The aster leafhopper, Macrosteles fascifrons (Stal); the English grain aphid, Macrosiphum avenae (Fabr.); the apple grain aphid, Rhopalosiphum fitchii (Sand.); and the greenbug, Schizaphis graminum (Rond.), usually arrive in Minnesota during late April or early May. Weather conditions favorable for northward movement of these insects consist of a high pressure area over the eastern states, a low pressure area over the western plains, and the resulting strong, persistent, south wind which is often called a low-level jet. The potato leafhopper, Empoasca fabae (Harris), usually arrives in southern Minnesota about May 20 and in central Minnesota about May 25. By mid-June it has usually dispersed to the northern part of the state. The corn leaf aphid, Rhopalosiphum maidis (Fitch), usually arrives during early June.

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