Use fungicides, such as copper-based products, to protect plants from infection.Systemic fungicides, such as dimethomorph, cymoxanil, fluopicolide and propamacarb have been registered for late blight control.It is important to apply fungicides preventively before the disease occurs and to follow the label instructions for proper application. Use fungicides that are effective against late blight, such as chlorothalonil, mancozeb, and metalaxyl.If infected by late blight, they will rot. If unsure about freedom from late blight, test a few seed tubers by lettings them sprout at 15-20 ☌ for 10–15 days.
#SIGNS OF LATE BLIGHT FREE#
It is important to use certified seed, i.e., that which is free from late blight infection, and viruses.Irrigation management: Avoid overhead irrigation, which can create favorable conditions for disease development.Removal of infected plant debris: Remove and destroy any infected potato plant debris to prevent the buildup of inoculum in the field.Early planting: Plant potato crops as early in the season as possible to reduce the period of susceptibility to the disease.The shape of the field may affect the ease and frequency of fungicide applications. Fields bordered by trees and dense vegetation should be avoided. Good drainage and good air movement will help reduce moisture levels in the crop canopy.Crop rotation: Plant potatoes in a different location each year to reduce the buildup of pathogen inoculum in the soil.There are several management strategies that can be used to control late blight in potato crops, including: Management of late blight of potato disease Phytophthora infestans produce sporangia or sac-like structures on sporangiophores and is a highly adaptable and virulent pathogens that can rapidly overcome plant resistance mechanisms. Phytophthora infestans is a water mold that belongs to the oomycetes group of organisms. The species name, Phytophthora infestans, literally means “infesting plant destroyer,”. The pathogen spreads by movement in infected tuber tissues and asexual reproduction of clonal lineages is common Late Blight of Potato Disease Cycle Pathogen If infected seeds are planted, local infection can occur. When conditions are favorable, the pathogen produces spores that can be carried by wind or rain and infect nearby potato plants. The pathogen can overwinter in infected plant debris or seed tubers, and can also survive on volunteer potato plants or other host plants. Late blight is a seed and soil-borne disease that thrives in cool, wet conditions. Soft rot (not to be confused with soft rock) bacteria will then invade causing the tuber to become smelly and rotten. The tubers will show signs of copper brown, reddish, or purplish color in the cracks, eyes, or lenticels. Tubers can also become infected when the sporangium is washed into the soil. Infected tubers develop dark, sunken lesions that can rot and become soft, leading to significant yield losses. Infected leaves may then wither and die, and the disease can also spread to the stems, tubers, and other parts of the plant.
The lesions may also have characteristic white mold growth on the underside of the leaf. As many lesions accumulate, the entire plant can be destroyed in a matter of days after the first lesions are observed if the appropriate fungicide applications are not used. Late blight of potato is identified by blackish/brown lesions on leaves and stems that may be small at first and appear water-soaked or have chlorotic borders but expand rapidly, and the entire leaf becomes necrotic. The symptoms of late blight in potato plants typically begin as small, water-soaked lesions on the leaves, which then enlarge and turn brown or black. Symptoms of Late Blight of Potato Disease Late blight of potato disease was recorded in India for the first time between 18 in the Nilgiri hills.
It is recorded on potatoes from Australia, India, American Samoa, Fiji, New Caledonia, New Zealand, and Papua New Guinea. Asia, North, South and Central America, the Caribbean, Europe, Oceania.
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