2025 IR-4 Performance Trials: Efficacy of Chlorantraniliprole and Zeta Cypermethrin against Corn Earworm in Hemp

Abstract: The corn earworm is a serious insect pest of outdoor hemp and it occasionally infests hemp grown under greenhouse conditions. Damage is caused by the larvae that bore into ?ower buds and blossoms. If reproductive tissue is not readily available, caterpillars will feed on foliar tissue. The feeding on reproductive tissue can cause terminal growth of foliage, leaf petioles, and stalks. In addition to direct feeding damage, there is concern that chewing injury may allow pathogens to grow in hemp buds as well. The objective of this study is to screen the efficacy and crop safety of chlorantraniliprole and zeta-cypermethrin against corn earworms in hemp grown under ?eld and greenhouse conditions.