Target spot

Target spot, or simply we can say early blight, is one of the most common diseases found in the potatoes and tomatoes. It is caused by alternariasolani which is a fungus. It originates as small circles to oval dark brown spots. These spots first enlarge then become oval to angular in shape. During favorable conditions, the individual spots start growing up to a certain height. When the disease becomes severe, all spots unite with each other and cause an upward rolling of the leaf tips and eventually lead to death as shown in Figure 13.3.