Mealybug Pests of Wine Grapes

Mealybugs are significant pests in vineyards, affecting both vine health and grape quality. Species such as the vine mealybug (Planococcus ficus) and longtailed mealybug (Pseudococcus longispinus) feed on plant sap, weakening vines and reducing vigor. Their feeding activity also produces honeydew, which promotes the growth of sooty mold, further impacting photosynthesis and fruit quality. Importantly, mealybugs are vectors of grapevine viruses, including Grapevine Leafroll-Associated Viruses (GLRaVs), which can reduce yield and wine quality over multiple seasons. Management of mealybugs involves monitoring populations with pheromone traps, applying targeted insecticides, encouraging natural predators such as lady beetles and parasitic wasps, and maintaining vineyard sanitation. Integrated pest management strategies are essential to control mealybugs effectively while minimizing environmental impact and protecting vineyard productivity.