Early blight—Alternaria solani
Early blight is primarily a disease of stressed or senescing
plants. Symptoms appear first on the oldest foliage. Affected
leaves develop circular to angular dark brown lesions 3 to
4 mm in diameter. Concentric rings often form in lesions
to produce a characteristic target-board effect. Severely
infected leaves turn yellow and drop. Dark brown lesions
develop on stems in later stages of the disease. Infected
tubers show a brown, corky dry rot.
Life cycle
Solutions
Early blight can be minimized by maintaining optimum growing conditions, including proper fertilization, irrigation,
and management of other pests. Grow later maturing, longer
season varieties. |
Early
blight lesions on leaf
 Lesions
on stem
|
