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Treatment early blight tomato cornell12/4/2023 ![]() ![]() When transplants will be grown by someone else, discuss their disease management plan in advance. Inspect plants at least once a week for disease symptoms obtain diagnosis if not positive about the cause and discard trays with seedlings confirmed to be diseased. Brushing to obtain short plants with thick stems is a great way to spread pathogens, especially bacteria. Adjust amount of water based on conditions (cloudiness and temperature) and plant size (need for water can vary substantially from day to day) soil mix that stays wet for prolonged period promotes root rot and slows seedling growth. Water during the day when foliage is dry and will quickly dry afterwards (morning is best) some pathogens are dispersed by splashing water and infect while the leaf surface is wet. Do not grow ornamental plants in the same greenhouse as tomato seedlings and manage weeds and thrips these other plants can harbor viruses, notably tospoviruses, which thrips vector. Do not reuse trays following outbreak of bacterial disease. Thoroughly clean and disinfect all surfaces. Control potential sources of pathogens and their spread in the greenhouse where transplants are grown, and avoid favorable conditions for disease development.Trisodium phosphate is common treatment for virus. Some seed companies treat seed with hot water or steam. Tomato seed can be treated with hot water which is especially useful for bacterial pathogens which can be inside seed. Purchase seed that has been tested for pathogens that can be seed-borne.See photographs and information in tomato factsheets. Understand important aspects of each of these pathogen’s life cycle, including potential sources, how spreads and survives, and favorable conditions. Know what diseases have and could occur on your farm.Occurrence varies farm to farm because some pathogens are not ubiquitous, reflecting their inability to spread far, and environmental conditions are not uniformly favorable. There are several diseases affecting tomato caused by fungi, oomycetes, bacteria, viruses, and nematodes. ![]()
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