Adults emerge from the soil in spring and fly to vineyards to feed and mate.
Plant injury usually occurs when shoots are 12 to 14 inches long and consists of feeding on developing fruit clusters and leaves. Spring treatments applied for other pests probably suppress most hoplia infestations that do occur. Few products are registered specifically for this use. The following materials are listed in order of usefulness in an IPM program, taking into account efficacy and impact on natural enemies. Extremely toxic to honey bees.