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This two-year study monitored the number of E. fabae at 3 locations within alfalfa fields (edge of field closest to trees and shrubs. 20 m from edge, and 40 m from edge) from mid-April to June and from adjacent tree and shrub species until July. Similar numbers of E. fabae were present on all tree and shrub species sampled (Acer negundo, Carya ovata, Celtis occidentals, Crataegus sp„ Fraximts americana, Gleditsia triacanthos, Ostrya virginiana. Prunus sp., Quercus alba, Quercus macrocarpa, Quercus rubra. Rhus glabra, Rosa multiflora, Tilia americana, Ulmus americana, and Zanthoxylum americanum). In addition, in 3 of 4 fields examined there were significantly more E. fabae found at the edges of the fields closest to the trees than at 40 m from the edge of the field during the 1st week of May. In subsequent samples, there was no difference in the distribution of E. fabae in the alfalfa field except at 1 field in which there were more E. fabae present in the edge than the middle for the duration of the study. Based upon this study, it does not appear that E. fabae are using adjacent trees to build up population numbers to infest nearby alfalfa fields in early spring. Introduction The potato leafhopper, Empoasca fabae (Harris) (Homoptera: Cicadellidae) overwinters in the Gulf States on evergreens (Pinaceae) and herbaceous vegetation (mostly

Enhancing biotic mortality of the potato leafhopper, Empoasca fabae