![]() The use of certified seed is highly recommended. Obtain seed from farms with effective disease management practices. Sources of disease include infected seed, cull piles and volunteers. The most important aspect of late blight management is to eliminate or reduce the initial source of the disease each season. Fungicides cannot be used alone for effective control of late blight, but must be used as one tool in an integrated management strategy. Since, late blight is a community disease, for effective control integrated management MUST be adopted. Each sporangium is capable of initiating a new infection that will become visible within three to four days and produce sporangia within another day or two under optimal conditions. ![]() Individual lesions can produce 100,000 to 300,000 sporangia per day. Epidemics can be rapid and devastating because of the high reproductive potential of this pathogen. Under dry conditions no sporulation occurs and the lesion has a brown dead center, surrounded by host tissue that has collapsed.ĭisease development (growth and reproduction of the pathogen) is favored by moderate temperatures and wet conditions. Lesions enlarge as the pathogen grows through the tissues, and the pathogen can sporulate from older lesions when the environment is favorable (leaf wetness and moderate temperature). Necrotic areas on some lesions are only 1 to 2 mm in diameter Infections are visible as small lesions after three to four days. Germination takes place either indirectly via zoospores or directly via a germ tube that penetrates into foliage, stems, or fruit to initiate infections. Sporangia can germinate within a few hours after landing on potato or tomato foliage if free moisture (e.g., dew, rainfall, sprinkler irrigation, fog) is present.
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