When growing eggplants in the garden, it isn’t uncommon to have issues now and then. One of these may include phomopsis blight. What is phomopsis blight of eggplant? Eggplant leaf spot and fruit rot, caused by the fungus Phomopsis vexans, is a destructive fungal disease that affects primarily fruit, stems, and leaves. Left uncontrolled, phomopsis blight in eggplants can cause the fruit to rot and become inedible. Read on for more information about blight in eggplants.
Symptoms of Eggplant Phomopsis Blight
On seedlings, phomopsis blight of eggplant causes dark brown lesions, just above the soil line. As the disease develops, the lesions turn gray, and the stems eventually collapse and the plant dies.
Blight in eggplants on established plants is evidenced by gray or brown, oval or round spots on the leaves and stems. The center of the spots lightens in color, and you can see circles of small black, pimple-like dots that are actually the fruiting bodies, or spores.
On fruit, phomopsis blight of eggplant begins with pale, sunken spots that may eventually take over the entire fruit. Tiny, black spots are visible in abundance.
Causes of Eggplant Leaf Spot and Fruit Rot
The tiny black spores of phomopsis blight live in the soil and spread quickly by rain splashing and overhead irrigation. Phomopsis also spreads easily on contaminated equipment. The disease is particularly favored by hot, damp weather conditions. Optimum temperatures for spread of disease is 84 to 90 degrees F. (29-32 C.).
Managing Blight in Eggplants
Destroy infected plant material and debris immediately to prevent spread. Never place infected plant matter in your compost pile.
Plant resistant eggplant varieties and disease-free seeds. Allow 24 to 36 inches (61-91 cm.) between plants to provide ample air circulation.
Water early in the day to allow foliage and fruit to dry before evening.
Rotate crops every three to four years.
Various fungicides may be helpful when used with the above methods of control. Spray at fruit set and repeat every ten days to two weeks until the eggplants are nearly mature. Experts at your local cooperative extension office can advise you about the best products and specific uses for your area.