![]() ![]() Near the edges of tips of foliage, and turn brown to purplish black (Fig. Late blightspots, caused by the fungus Phytopthora infestans, start out pale green, usually Early blight and closely related diseasesĭo not confuse early blight with two other diseases, late blight and Septoria leaf With a similar dark and sunken target-like appearance are often found at or above Time, the stem and fruit may also be infected, showing dark and sunken spots. The disease progresses, spots merge together and may kill the whole leaf. Rings or ridges that form a target-like pattern surrounded by a yellow halo. The spots are up to a half-inch in diameter, with concentric What are the symptoms of early blight?Įarly blight is identified by the appearance of a few (5 to 10 in most cases) circularīrown spots on a leaf. High humidity and temperaturesĪbove 75☏ favor disease development. Germinated conidia infect tissues if foliage remains wet forĪnother 5 to 10 hours, depending on the temperature. Conidia germinate in the presence of a thin film Spores surviving in the soil or plant debris are splashed on the lower leaves during With infected seeds that initiate the disease in the spring. How is early blight spread?Įarly blight fungus survives the winter on infected plant debris, or it can be brought Early blight can also affect potato foliage. ![]() It brings significant damage to tomato leaves, stems, andįruits almost yearly in West Virginia. Lawn, Gardening & Pests Learning ActivitiesĮarly blight, caused by the fungal pathogen Alternaria solani, is one of the mostĬommon tomato diseases. ![]()
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