Gray Leaf Spot on Tomato Leaves
If your tomato plants have unusual brown or gray spots on the underside of leaves, then you may have a gray leaf spot problem. The spots begin as small black or brown specks on both young and mature tomato leaves, resulting in unhealthy and diseased looking plants.
Causes and Symptoms
The cause of gray leaf spot disorder usually begins on tomato seeds in the form of a fungus. The spores of the fungus travel to other plants by rain or wind. Once they find a wet leaf, the spores grow and develop. Warm, moist climates encourage this type of fungal growth.
Symptoms include tiny black or brown spots or dots. As the disease grows, the leaves become yellow and the spots turn to a brown or gray color. Numerous spots or holes appear all over the tomato plant leaves. Plants look unwholesome and sick.
Treatments and Control
Treatment is important when you first begin to notice a change in your plants. Check them periodically for any signs of spots or specks. If you do find evidence, begin treatment as soon as possible.