Leafhoppers rarely warrant control in soybeans, Threshold in edible beans prior to podding is 1 leafhopper on every second trifoliate. Hot, dry weather will favour numbers increasing. Edible beans can sustain higher populations under good growing conditions. Leafhoppers look like tiny, green wedge-shaped insects that appear on the underside of leaves. Potato leafhoppers can be very damaging to alfalfa, reducing growth, lower protein levels and reduce vigour in alfalfa.
Symptoms appear as a wedge-shaped yellow area in the leaf tip.
As damage increases, yellowing spreads over the entire leaf, giving fields a yellowish coloration and growth appears stunted. New seedlings can be severely weakened by leafhoppers. The most effective products for control are Cygon and Lagon. Both of these products are systemic, provide some residual but are also highly toxic to bees. Remember to spray in the evening or early morning when bees are less active .