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Potato Leafhopper Control in Beans
Soybean and dry bean fields should be checked for potentially damaging infestations of potato leafhoppers. The adult is wedge shaped and pale green in color. Adults are very active, jumping or flying when disturbed. Nymphs are wingless. Both adults and nymphs will run backwards or sideways rapidly. Large numbers of adults may appear early in the season. Nymphs usually complete their growth on the leaf where they hatched, feeding on the underside of the leaf. For this reason, nymphs are regarded as more injurious to beans.
Damage by leafhoppers result in bean foliage becoming dwarfed, crinkled and curled. The leaves also appear brown and chlorotic due to the toxicogenic effects of the leafhopper saliva.
The threshold for basing spray decisions is when an average of one leafhopper nymph per trifoliate leaf is found. The nymphs are sampled by selecting leaves, and counting the number present. Sample for the presence of adult leafhoppers by using a sweep net. Do not let infestations and damage progress to the point that yellowing of foliage is easily detected.
Several products are labeled for potato leafhopper control in soybean and dry beans.
For more information see the Field Crop Insect Management Guide at http://www.ext.nodak.edu/extpubs/plantsci/pests/e1143w1.htm
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