![]() To increase the chances of avoiding late blight infection in 2012, it is important to understand the disease and to be able to identify it early. For this reason, it is critical to start with potato seed or tomato transplants that are free of late blight. However, there can be no disease if the inoculum is absent. ![]() MAFRD is involved in the running of a Weather Network, which is used for late blight forecast. Strains active in other regions of North America, especially just south of the border, could affect what we see here in Manitoba.ĭevelopment of late blight is very much weather dependent. This suggests that the population of late blight strains in Manitoba is dynamic and variable. The late blight fungus strain was mostly US#24. However, the story in 2011 was very different - late blight disease in Manitoba was at moderate levels on potato, while the tomato crop escaped almost unaffected. The pathogen strains were US#23 (mostly on tomato, some potato) and US#24 (mostly potato). Late blight devastated tomato plants in many home gardens throughout Manitoba. In 2010, there was an early onset of late blight in June and later that summer there was a major problem on tomatoes and potatoes across the Canadian prairies. Inspection of the greenhouse tomato transplants has to-date shown no infected plants in Manitoba in 2012. The distribution of late blight disease could depend on how effective the surveillance for late blight is and also the weather in general. These two facts could have an impact on the late blight development and progress in 2012. Florida supplies tomato seedlings to a large portion of the US. The strains of the fungus from Florida are reported to be changing and appear to be more tolerant to warmer temperatures. Late Blight Disease Management: Before It Becomes A Serious ProblemĪs early as February 2012, moderate to severe levels of late blight have been reported from Florida.
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