How to Manage Pests
UC Pest Management Guidelines
Several species of leafhoppers are found in dry beans with Empoasca fabae and E.solana being the most common. They are nearly identical morphologically and can only be distinguished by experts. The damage they cause is also nearly identical as are the treatment guidelines.
Empoasca leafhoppers are small (0.125 inch [3 mm] long), bright green, wedge-shaped insects. The small, wingless nymphs (immatures) are also wedge shaped and green and move rapidly forward, backward, and from side to side. Both adults and immatures are found primarily on the underside of leaves.
Empoasca leafhoppers cause a symptom known as hopperburn in which the leaf margins turn yellow, particularly at the leaf tip, and these areas soon become necrotic. The entire leaf may become yellowed and the symptoms often resemble virus symptoms. The presence of adult and immature leafhoppers on the undersurface of the leaf serve to distinguish leafhopper injury from virus symptoms or mineral deficiencies.
Start inspecting plants for leafhopper damage along with other pests and their damage during the vegetative growth period. Continue looking through the flower bud-to-bloom and pod fill periods. Look for plant damage and Empoasca leafhoppers on the undersides of leaves. Examine a minimum of 10 leaves from 10 plants in at least four areas of the field. Measurable thresholds are not available.
UC IPM Pest Management Guidelines: Dry