Destroy all tomato, potato, eggplant, and pepper debris after harvest. When late blight has developed on foliage and fruit or tubers are at a risk of infection, make sure that vines have been completely dead for 2 – 3 weeks before harvest as the fungus does not survive very long in dead foliage. Overhead sprinklers can favor late blight. Late blight of potato, which is caused by Phytophthora. Air circulation to facilitate the drying of foliage each day is important. Keywords: Irish Famine Pathogen Integrated Disease Management (IDM) Life cycle. Potatoes infected with late blight are purplish and shrunken on the outside. High humidity and average temperatures in the range of 50 to 78☏ favor the disease. Late Blight Sporulation of Late blight (Phytophthora infestans) on potato stems. Late blight can develop and spread rapidly if inoculum is present and conditions are conducive. The fungus inoculum can originate from seed tubers, cull piles, volunteers, closely related weed hosts such as nightshade, and adjacent plantings of potatoes or tomatoes that are affected. Late blight occurs commonly in coastal environments and sporadically elsewhere. Fruit discoloration usually begins on the upper side of the fruit. On stems and petioles, lesions are brown to black and may also support sporulation of the fungus. White sporulation of the fungus may be observed at the periphery of lesions, principally on the underside of leaves. Lesions may expand rapidly and become brown to purplish black. On leaves, late blight lesions typically first appear as irregular, small pale to dark green water-soaked spots that are surrounded by a zone of yellowish tissue. Phytophthora infestans has a wide host range, including tomato, potato, pepper, and eggplant. How to Manage Pests Pests in Gardens and Landscapes UC IPM Home > Homes, Gardens, Landscapes, and Turf > Vegetables > Diseases
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