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Unlike the obvious feeding damage of the alfalfa weevil symptoms of leafhoppei feeding are not apparen dntil serious damage hai already occurred. Both adults and nvmphs insert theii
hypodermic syringe-like mouth parts into the plant and remove plant juices.
Potato leafhoppers breed on crops and weeds throughout the winter in the gulf states, then migrate northward on wind currents during the spring.
Alfalfa fields in Virginia are colonized by leafhopper adults usually during late May and early June. Reproduction occurs and several generations develop during the summer. Potato leafhoppers do not overwinter in Virginia.
“Although several natural enemies prey upon the potato leafhopper in alfalfa, damaging levels of leafhopper are often reached, requiring insecticide application or harvest management. Leafhopper infestations are highly variable from field to field and from year to year, therefore monitoring of individual fields is required for effective pest management decision making." Owings has a chart for farmers who know they have an infestation and are wondering if spraying makes economic sense at different stages in the field’s growth. Determining the degree of infestation before serious damage is done involves making a sweep of portions of the field with a net, :harting the number of leafhoppers per sweep as .'ompared to the stem length of the alfalfa, and making a iecision based on these two actors. Owings is recommending
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