From the Disease tab, select the “Early Blight” model. To view the predicted early blight risk on any given day, visit the Vegetable Disease and Insect Forecasting Network (VDIFN) website. Conceptually, they are similar to Growing Degree Days, which are used to track how plants and insects develop over a season in response to daily air temperature highs and lows. How can I predict when early blight is likely to develop?Įarly blight can be modeling using what are called Physiological Days (P-days), which quantify the amount of heat energy available to promote disease development throughout a season. Denser foliage leads to high humidity and longer periods of leaf wetness that favor the disease. Early blight symptoms typically begin as plant canopies start to close.
Where does early blight come from?Įarly blight is caused by the fungus Alternaria solani, which survives in plant debris or on infected plants. Early blight can lead to total defoliation of lower leaves and even the death of an infected plant. Eventually multiple spots on a single leaf will merge, leading to extensive destruction of leaf tissue. As these spots enlarge, concentric rings appear giving the areas a target-like appearance. Symptoms of early blight first appear at the base of affected plants, where roughly circular brown spots appear on leaves and stems. The second common tomato blight, Septoria leaf spot, is detailed in University of Wisconsin Garden Facts XHT1073. Early blight can also be a serious disease on other popular Solanaceous vegetables including eggplants, peppers, and potatoes. Early blight is one of two common fungal diseases that can devastate tomatoes in both commercial settings and home gardens.
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