![]() solani generally occur on the oldest leaves and start as small lesions that are brown to black in color. solani include leaf spot and defoliation, which are most pronounced in the lower canopy. melongena L.), bell pepper and hot pepper ( Capsicum spp.), and other members of the family Solanaceae. "Bullseye" patterned leaf lesion of Alternaria solani Hosts and symptoms Īlternaria solani infects stems, leaves and fruits of tomato ( Solanum lycopersicum L.), potato ( S. solani is also present in most potato production regions every year but has a significant effect on yield only when frequent wetting of foliage favors symptom development. ![]() solani is generally not an issue in the less humid Pacific or inter-mountain regions. solani is problematic in tomato production areas east of the Rocky Mountains and in the midwest, however, A. Early blight can also be caused by Alternaria tomatophila, which is more virulent on stems and leaves of tomato plants than Alternaria solani. Primary methods of controlling this disease include preventing long periods of wetness on leaf surfaces and applying fungicides. If uncontrolled, early blight can cause significant yield reductions. Despite the name "early," foliar symptoms usually occur on older leaves. The pathogen produces distinctive "bullseye" patterned leaf spots and can also cause stem lesions and fruit rot on tomato and tuber blight on potato. Martin, (1882)Īlternaria solani is a fungal pathogen that produces a disease in tomato and potato plants called early blight. solani Neerg., (1945)Īlternaria solani (Ellis & G. Remember to practice good sanitation in the garden, rotate crop families and avoid overhead irrigation and you will be less likely to have disease issues.Alternaria porri f.sp. Thorough coverage of the tops and undersides of the leaves is important. Remove and dispose of any affected plant parts, especially before spraying, and be sure to disinfect pruners between plants.Ĭopper sprays can slow or prevent the spread. If you see infection on just a single plant, consider removing that plant to prevent spread to your other tomato plants. Stripey aka Tigerella, Black Plum and Legend are some others. There are a just a few resistant varieties, with Juliet being the most popular. Plant your tomato plants far enough apart that they receive good air circulation. Overhead irrigation can splash fungal spores up on the bottom leaves of the plant, and wetting the leaves provides an environment conducive to fungal growth. ![]() ![]() ![]() This will prevent fungal spores from splashing up on the bottom leaves when it rains.Īvoid overhead irrigation and use drip irrigation when possible. Try to rotate so that the same plant family is only in the same area of the garden for one out of every three years.Īnother helpful practice is to remove the lower leaves of the tomato plant as the plant grows, so that the bottom foot of the stem is bare. will go a long way in preventing disease from recurring every year. Tomatoes, potatoes, peppers and eggplant are all in the same family, so rotating southern peas, corn, squash, etc. Since the fungus can persist for at least one year in the soil, crop rotation is quite important. The fungus often overwinters in debris from the previous season in the soil. Dark spots with concentric rings develop on the leaves, and if the fruit is affected spots begin at the stem end, forming a dark sunken area with concentric rings. The Early Blight fungus generally starts at the bottom of the plant, affecting leaves, stems, and fruits. As with most diseases, stressed plants or plants in poor health are more susceptible. Early Blight is a common fungal disease of tomatoes caused by the fungal organism Alternaria solani. ![]()
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