Sunken brown or black lesions at the soil line are characteristics, followed by collapse of the plants onto the soil. Fungicide seed treatments can aid in preventing seedling blight. Proper seed bed preparation, weed control, and seed placement can aid in reducing seedling blight. Caused by Erysiphae polygoni Powdery mildew is one of the most common diseases of clovers. The powdery mildew fungus is composed of many strains that can be restricted to specific hosts.
Primary symptoms are a light-gray to white powdery growth on the upper surface of the leaf.
Infected leaves remain green for some time but ultimately lose their color, appearing first yellow then brown and dry. The fungus survives as dormant mycelium within the host. Wind and rain spreads the fungus to neighboring plants. Grazing or cutting at timely intervals can help in reducing the amount of inoculum to infect new growth. For more information , contact your county Extension office.