Early blight (Alternaria leaf spot) is caused by the fungus   Alternaria solani. Symptoms become prevalent during the hotter months. This disease produces brown to black, target-like spots on older leaves.  It is best to apply control BEFORE spots appear.  

If severe, the fungus also attacks stems and fruit. Affected leaves may turn yellow, then drop, leaving the fruit exposed to sunburn. Sanitation is the best control. Remove all diseased plant tissue on the ground, as the fungus overwinters on leaf debris.

Do not plant tomatoes in the same place next year. Space plants farther apart to improve air circulation. Avoid overhead irrigation. If the infestation is heavy, sulfur dust may help protect new leaves from infection.

Mancozeb Flowable w/Zinc Conc.

Mancozeb w/Zinc 37.0% A broad spectrum fungicide for use on a wide variety of vegetables and ornamentals. Controls leaf spot, downy mildew, blights, anthracnose, botrytis and other listed diseases.