The parasite does not overwinter here, but provides excellent long-season control of the beetles. This wasp has been tested in snap beans and soybeans in New Jersey and Maryland. A single release, timed so that wasps can attack bean beetle larvae, can provide control. Wasps reproduce in the field and are still present when the second generation hatches out. Damage is greater in plants that are infested early in their growth.
Thresholds are two hoppers per foot of row in seedlings, five per foot of row after seedling stage.
Rotenone does not work on leaf hoppers. Concentrated pyrethrum materials are the best thing organic growers have. The two I know of are Pyrenone and Pyrenyl. Potato leafhopper numbers are still high in both potato and eggplant too. Check undersides of leaves for adults or nymphs.