![]() Hybrids with high levels of resistance to early blight are present among progeny from S. This is somewhat surprising, as resistance against necrotrophic plant pathogens is usually a quantitative trait or inherited recessively according to the inverse-gene-for-gene model. This cross resulted in triploid progeny in which resistance was inherited dominantly. tuberosum, despite a differing endosperm balance number. malmeanum was also crossed with diploid S. tuberosum gave rise to a population in which resistance was inherited quantitatively. Here, we identify two wild potato species, which are both crossable with cultivated potato ( Solanum tuberosum), that show promising resistance against early blight disease. solani is developing resistance against fungicides, and potato cultivars with genetic resistance to early blight are currently not available. The disease is usually controlled with fungicides. Remove plant debris and weed hosts at the end of the season to mitigate areas where the disease may overwinter.Early blight is a disease of potato that is caused by Alternaria species, notably A. Any damage done at harvest can additionally facilitate the disease. Only dig the tubers up when they are completely mature to prevent damaging them. Keep the potato plants healthy and stress free by providing adequate nutrition and sufficient irrigation, especially later in the growing season after flowering when plants are most susceptible to the disease. That is, do not replant potatoes or other crops in this family for two years after a potato crop has been harvested. Treatment of early blight includes prevention by planting potato varieties that are resistant to the disease late maturing ones are more resistant than early maturing varieties.Īvoid overhead irrigation and allow for sufficient aeration between plants to allow the foliage to dry as quickly as possible. Lesions begin to appear two or three days after the initial infection. They gain entry via wounds caused by mechanical injury or insect feeding. These spores are then spread through wind, splashing rain, and irrigation water. (5-30 C.) with alternating periods of wetness and dryness. Spores are produced when temperatures are between 41 and 86 degrees F. ![]() The spores and mycelia of the pathogen survive in infested plant debris and soil, in infected tubers and in overwintering host crops and weeds. If the disease is in its advanced stages, the tuber flesh looks water soaked and yellow to greenish yellow in color. If sliced open, the potato flesh will be brown, dry, and corky or leathery. ![]() The tubers will have dark gray to purple, circular to irregular lesions with raised edges. Dark brown to black spots may also occur on the stems of the plant. These lesions often look like a target, and, in fact, the disease is sometimes referred to as target spot.Īs the spots enlarge, they may cause the entire leaf to yellow and die but remain on the plant. Dark, brown spots appear on this older foliage and, as the disease progresses, enlarge, taking on an angular shape. Symptoms first occur on the lower or oldest leaves of the plant. Symptoms of Potatoes with Early BlightĮarly blight rarely affects young plants. In contrast to its name, early blight rarely develops early it actually usually affects mature foliage rather than young, tender leaves. Although not a terminal disease, severe infections can be fairly detrimental. Potatoes become infected with early blight when foliage has become excessively wet due to rain, fog, dew, or irrigation. The disease is caused by the fungus Alternaria solani, which can also afflict tomatoes and other members of the potato family. What is Potato Early Blight?Įarly blight of potato is a common disease found in most potato growing regions. What is potato early blight? Read on to learn how to identify potatoes with early blight and about potato early blight treatment. If your potato plants start to exhibit small, irregular dark brown spots on the lowest or oldest leaves, they may be afflicted with early blight of potatoes.
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