As of today, the spore traps have not detected the downy mildew spores at our monitoring locations on the east side of the state. Note: Cantaloupe crops are also at risk of becoming infected by the downy mildew pathogen and should be protected using the fungicides that have been proven to be effective in MSU research cucumber field studies. Downy mildew can infect all cucurbits including cucumber, melon, pumpkin and squash. Downy Mildew, caused by Pseudoperonospora cubensis, is an oomycete that is not a true fungus. We are working with growers, scouts, consultants and MSU Extension educators to make sure we get suspect samples immediately and make a diagnosis. Growers in other regions of the state could consider a 10-day application schedule until the first outbreak is detected. This is the first confirmation of this devastating disease in the state for 2020. If found in a home garden, remove and destroy diseased plants immediately to prevent spreading to other plants. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Monitor plants for symptoms of disease, especially from August through harvest. Cucurbit downy mildew in a cucumber field with many necrotic and chlorotic lesions. It thrives in wet or very humid conditions as a water mold. Under humid conditions, downy mildew rapidly reproduces and spreads, resulting in severe crop damage. View the spore trap results and current downy mildew news. Pale green to yellow spots form on upper surface of leaves, and later turn brown. Downy mildew can infect all cucurbits including cucumber, melon, pumpkin and squash. Connect with Commercial Fruit and Vegetable, Downy mildew of cucumber, melon and squash. Systemics are more effective if weather conditions are conducive to disease and the host is very vulnerable. Cucumber downy mildew (143) - Worldwide distribution. Use drip irrigation and wide row spacing to dry the leaves and encourage good air movement around the plants. Hausbeck closely monitors cucumber downy mildew … 2020 For downy mildew to occur in Minnesota, air currents must blow the spores. The cucurbit downy mildew pathogen P. cubensis results in defoliation, poor plant health, and significantly reduced fruit yields due to sun scald, reduced nutrition, and secondary rots. Downy mildew can start an infection in a wide range of temperatures (41-86° F) but is most severe from 59-68° F. The pathogen needs moisture on the leaf surface in order to germinate and start a new infection. Check out the MSU Agricultural Industries Certificate Program! Because downy mildew doesn’t survive the winter, the pathogen must re-emerge each growing season. June 22, 2020. Downy mildew on cucumber has been verified in Berrien County, which is located in southwest Michigan. Moderate to low levels of resistance are available for melons. Updated July 2020. Some resistant varieties are available for pumpkins and winter squash, but this is usually specific to certain pathotypes of downy mildew and may not be effective in all cases. Downy mildew lesions on a cucumber leaf. Commercial growers should read and follow all application instructions in the Midwest Vegetable Production Guide. It cannot survive on plant debris and only grows on living plant tissue. This is one of the most common and destructive diseases affecting all cucurbit crops in the eastern United States including New York. The downy mildew pathogen is an obligate parasite that needs living cucurbit plants in order to grow and survive. The pathogen can move on air currents, splashing water and on the tools and hands of workers. This is most distinct in cucumber. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. The disease affects cucurbit crops in the field and those grown in passive or traditional greenhouses. The leaves appear as if frost had killed them. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Fungicides are effective if applied before disease becomes severe. Prior to that, it had not been effective. © However, in other years, it has been common to record the first field outbreak around the first week of July. It thrives in wet or very humid conditions as a water mold. It is important to rotate systemic fungicides or tank mix with a contact to avoid this. Mary Hausbeck, Michigan State University, Department of Plant, Soil and Microbial Sciences - To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. Downy mildew … Although it can be a problem in field, hoop house and greenhouse conditions, there have not been any reports of it in Minnesota. On members of the cucumber family (cucurbits): important on cucumber, rockmelon and zucchini, but also on gourd, melon, pumpkin, … There are several strains of downy mildew that attack different crops. Regents of the University of Minnesota. Commercially important species of cucurbits include watermelon (Citrullus lanatus), muskmelon (Cucumis melo), cucumber … For more information, visit https://extension.msu.edu. Leaf spots are angular bounded by leaf veins. Our spore trap webpage is updated with the latest results on Thursday morning of each week. Cucumber varieties with moderate to high level of resistance are available. Many of the pickling cucumber crops are still quite young and should be protected, as a downy mildew infection at this stage would likely hurt yields significantly. Alternate among these recommended fungicide treatments using a seven-day application interval. Downy Mildew, caused by Pseudoperonospora cubensis, is an oomycete that is not a true fungus. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. In wet or very humid conditions, disease develops rapidly. Also, keeping an eye on the spore trap results across the state could be helpful in knowing when the cucumber downy mildew pathogen has been found in your particular production region. MSU is an affirmative-action, equal-opportunity employer. The pathogen can move on air currents, splashing water and on the tools and hands of workers. Plant resistant varieties when available. The disease outbreak consisted of several plants with the characteristic “window-pane” yellow-brown lesion bordered on each side by the leaf veins (Photos 1-2). To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). View the spore trap results and current downy mildew news. One of the principal means of managing downy mildew in cantaloupe and cucumber is the use of genetically resistant cultivars. We are able to distinguish between cucumber and hop downy mildew spores using molecular tools and both are reported.
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