A fungal disease that infects ornamental plants, vegetables, fruit trees, tomatoes, potatoes and peppers and shade trees. Brown to black spots form and enlarge on lower leaves developing concentric rings like a target. Heavily infected leaves dry up and die as spots grow together. Target like, sunken spots will sometimes develop on tomato branches and stems. Both fruits and tubers can also develop dark, sunken spots. Spores are carried by the air and are a common cause of hay fever allergies. Control this disease by planting resistant cultivars and soaking seed in a disinfecting solution such as a hydrogen peroxide mixture before planting. Spray plants with compost tea, treat soil with cornmeal products.