Victoria Plum Tree Disease: Identifying and Managing Common Problems

Victoria Plum Tree Disease: Identifying and Managing Common Problems

When Victoria plum fruits develop a scale-like coating, exude gelatinous droplets, and eventually turn dark blue, shrivel, and rot, two primary issues are likely at play. The liquid droplets often signal the presence of plum curculio, a boring insect that lays eggs in developing fruit. The fruit rot is typically brown rot, a fungal disease that causes fruit to become mushy, develop a gray fuzz, and mummify on the tree.

Insect Management

For plum curculio and scale insects, apply dormant oil during late winter or early spring when temperatures are below 80°F. Consult your local garden center for approved insecticides and timing specific to your region.

Fungal Control

Brown rot management relies on sanitation and timely fungicide applications. Prune out dead or diseased wood before spring, remove all fallen fruit, and apply fungicides labeled for brown rot at critical growth stages. Your county Extension office can provide a spray schedule tailored to local conditions.

Feeding Plum Trees

Conduct a soil test through your Extension office to determine nutrient needs. Apply a balanced fertilizer (e.g., 10-10-10) at the recommended rate based on trunk diameter, spreading it evenly under the canopy and watering thoroughly.