Leaf Spots

Leaf spot diseases attack practically all plants, especially those in more humid regions.  Spots appear on lower leaves and progress upward.  Spots may later enlarge and run together, forming leaf blights.  Spots usually have light centers and dark margins.  Infected leaves may be killed or drop early.

Control with general sanitation, such as collecting and burning fallen leaves.  Plant rotation is also useful.  Use of recommended fungicides must begin soon after the disease strikes.