Disease biology and mid-season recommendations The indication of high risk was communicated early in the season to the industry this included information from the university that winter temperatures may have resulted in a high likelihood that volunteer tubers would have survived the winter feedback from scouts that survival of volunteer potatoes was profuse. Recommendations for appropriate late blight control where late blight has been confirmed or is suspected should include approaches suggested in Table 1 and include desiccation of infected areas. Sample symptomatic plants and send them for diagnosis and continued application of residual protectant fungicides. The US-8 is resistant to the phenylamide class of fungicides.Ĭontinue scouting on a weekly basis where late blight has not been reported and treat fields aggressively in areas where late has been reported (see Table 1 for recommendations). There has also been reports of the US-8 clonal lineage in parts of the U.S. in recent years and in general is still managed well with phenylamide fungicides. The US-23 clonal lineage has been reported in Michigan and most of the U.S. This year to date, late blight has been confirmed on tomato or potato in the states of Connecticut, Florida, Massachusetts, Maine, New York, North Carolina, Pennsylvania, Virginia, Washington and Wisconsin, and Manitoba and Ontario, Canada.įor the reported cases that have been genotyped, the pathogen was either US-23 or US-8 (Washington and Wisconsin). This resource provides updated information on the detection and characterization of late blight on potato and tomato crops in the U.S. National late blight updates can be found at USA Blight. Continued monitoring for late blight is recommended. Forecasts and disease severity value (DSV) accumulations can be checked daily at MSU’s Late blight Forecast page. See the station comparison page at Todays Lateblight Forecast. Recommendations for late blight treatment remain the same as in previous reports posted at MSU Extension and include treating with one of the translaminar fungicides listed at the Michigan Late Blight Risk Monitoring website.Ĭonditions remain conducive for late blight development. Although a few fungicides have yet to be added, you can view the current fungicide rates.Īreas in fields that are particularly vulnerable are field margins, especially those close to tree lines, raised cable lines and where water can accumulate such as around pivot tracks and tractor wheel lines. Applications should include a translaminar fungicide in combination with a protectant (chlorothalonil plus mancozeb) and Super Tin. Growers should be aggressively treating all fields on a minimum five-day schedule in Montcalm County. Mating type and Ridomil sensitivity are underway. ![]() Initial genotyping confirmed isolates as US-23 by GPI isomerase testing, conducted by the Michigan State University Potato and Sugar Beet Pathology Laboratory. Late blight was found in potato crops near Edmore, McBride and Vestaburg, Michigan, in Montcalm County Aug.
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