Rotate out of tomato or potato for two years.įungicides are necessary where the disease has occurred in the past.Ĭlick here for fungicide options for commercial farmers.Ĭlick here for fungicide options for home gardeners.Avoid overhead irrigation and excessive nitrogen applications.Once the disease is detected, immediately remove and destroy infected plants.Eliminate cull piles, plant debris, and volunteer potato and tomato plants.Check wet areas of the field first (low spots in the field, edges near hedgerows, shaded areas, etc.).Early detection is important as rapid spread can occur. Start scouting for this disease soon after planting. Late blight, an infamous plant disease affecting potato and tomato, can be mitigated: learn controls, the life cycle, seasonal guidelines, and more, here.Infected tomato fruits and potatoes develop hard, brown, blotchy lesions that extend into the flesh GENERAL MANAGEMENTĮpidemics are rare and localized in Utah. Lesions on leaves and stems start as a greasy-gray blotch, and eventually turn black. Managing potato late blight at the center of origin: integrating durable resistance with a decision support system. Later in the season, infected tissue releases additional spores, causing new secondary infections and sometimes, epidemics can wipe out entire fields.Īll above-ground portions of plants can be infected, plus potato tubers. Potato late blight management in the Toluca Valley: Field validation of SimCast modified for cultivars with high field resistance.Storms from southern states can also contribute to spread of spores. Under wet conditions, spores form in early spring and are carried for miles to cause primary infections on succulent plant tissue.Overwinters in infected potato tubers left underground or in cull piles.Late blight is caused by the fungus Phytophthora infestans. It is a concern when n leaves are wet for more than 10 to 12 hours at moderate temperatures (60-80☏). Late Blight on Potato Tuber (Cornell University Extension) HOSTS Late Blight on Potato Foliage (Michigan State University Extension) Late Blight on Tomato Leaf (Inga Meadows, North Carolina State University Extension)
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