Our spore trap webpage is updated with the latest results on Thursday morning of each week. 2020 Mary Hausbeck, Michigan State University, Department of Plant, Soil and Microbial Sciences - Under humid conditions, downy mildew rapidly reproduces and spreads, resulting in severe crop damage. 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 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. … View the spore trap results and current downy mildew news. The pathogen can move on air currents, splashing water and on the tools and hands of workers. The University of Minnesota is an equal opportunity educator and employer. It is very important that cucumber growers use a proven downy mildew program with fungicides that have shown good activity in our yearly Michigan research plots including: *Note: Previcur Flex is back in the downy mildew fungicide recommendations for 2020 as it has been effective in the MSU research trials in 2018 and 2019. Pale green to yellow spots form on upper surface of leaves, and later turn brown. Connect with Commercial Fruit and Vegetable, Downy mildew of cucumber, melon and squash. However, in other years, it has been common to record the first field outbreak around the first week of July. Growers on the west side of the state should be using this short, seven -day application interval for their fungicide sprays. Cucumber downy mildew (143) - Worldwide distribution. Downy mildew of cucumber is caused by Pseudoperonospora cubensis, a member of the water mold group (Oomycota) of fungal-like organisms. Leaf spots grow together and entire leaves turn brown. It is possible to see a healthy pumpkin field alongside a severely diseased cucumber field for this reason. 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). This is most distinct in cucumber. This is the first confirmation of this devastating disease in the state for 2020. Commercially important species of cucurbits include watermelon (Citrullus lanatus), muskmelon (Cucumis melo), cucumber … On watermelons, an exaggerated upward leaf curling is common. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. This is one of the most common and destructive diseases affecting all cucurbit crops in the eastern United States including New York. Extension is expanding its online education and resources to adapt to COVID-19 restrictions. 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. For downy mildew to occur in Minnesota, air currents must blow the spores. June 22, 2020. We will be watching the production areas carefully for the movement of downy mildew. There are several strains of downy mildew that attack different crops. Check out the MSU Agricultural Industries Certificate Program! Regents of the University of Minnesota. The disease affects cucurbit crops in the field and those grown in passive or traditional greenhouses. Introduction. Moderate to low levels of resistance are available for melons. This article was published by Michigan State University Extension. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Dark purplish grey fuzz forms on underside of the leaf in high humidity. It cannot survive on plant debris and only grows on living plant tissue. On members of the cucumber family (cucurbits): important on cucumber, rockmelon and zucchini, but also on gourd, melon, pumpkin, … It thrives in wet or very humid conditions as a water mold. Downy mildew … Downy Mildew, caused by Pseudoperonospora cubensis, is an oomycete that is not a true fungus. Check out the MSU Viticulture Certificate Program! In wet or very humid conditions, disease develops rapidly. MSU is an affirmative-action, equal-opportunity employer. Downy Mildew, caused by Pseudoperonospora cubensis, is an oomycete that is not a true fungus. Downy mildew on cucumber has been verified in Berrien County, which is located in southwest Michigan. All rights reserved. It thrives in wet or very humid conditions as a water mold. Use drip irrigation and wide row spacing to dry the leaves and encourage good air movement around the plants. Growers are urged to apply fungicides immediately. © Downy mildew of cucurbits can be found in temperate areas, such as the Americas, Europe, Japan, Australia and South Africa, tropical regions and some semi-arid regions, such as the Middle East. Plant resistant varieties when available. Downy mildew can infect all cucurbits including cucumber, melon, pumpkin and squash. Commercial growers should read and follow all application instructions in the Midwest Vegetable Production Guide. A spore trap placed in Muskegon County detected downy mildew sporangia for one day last week but diseased plants have not yet been confirmed in this county. Downy mildew lesions on a cucumber leaf. The leaves appear as if frost had killed them. Causal Agent. Cucurbit downy mildew in a cucumber field with many necrotic and chlorotic lesions. 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. Leaf spots are angular bounded by leaf veins. It is important to rotate systemic fungicides or tank mix with a contact to avoid this. The downy mildew pathogen is an obligate parasite that needs living cucurbit plants in order to grow and survive. The counts of the downy mildew sporangia from a field are always a few days behind due to processing of the spore tapes. 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. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. Cucurbit downy mildew is a major disease that affects all cucurbits. Hausbeck closely monitors cucumber downy mildew … This early infection is possibly due to a change in the pathogen's biology or due to greenhouse production of cucurbits that allows the pathogen to overwinter on living plants. In eastern states with similar conditions, downy mildew does not arrive until the end of the growing season, often in August. Downy mildew can infect all cucurbits including cucumber, melon, pumpkin and squash. Occurrence varies spatially and temporally year to year with movement of this wind-dispersed pathogen. The warm and humid weather conditions this month favors downy mildew. We are working with growers, scouts, consultants and MSU Extension educators to make sure we get suspect samples immediately and make a diagnosis. For more information, visit https://extension.msu.edu. We are able to distinguish between cucumber and hop downy mildew spores using molecular tools and both are reported. However, downy mildew has arrived in the Midwest earlier in the season. Downy mildew does not create viable oospores (thick-walled resting structures) that would allow it to survive Minnesota's harsh winter. Cucumber varieties with moderate to high level of resistance are available. Since we cannot yet predict whether this year’s downy mildew population will be controlled by Previcur Flex, be sure to use it as a tankmix with either chlorothalonil or mancozeb. Click here for instructions on how to submit samples. Using the same systemic fungicide repeatedly can result in fungicide resistance. Both contact and systemic fungicides are available for use against downy mildew. Resistance has not been developed in other cucurbits, though some squash varieties like Super Select and Zucchini Select are considered to be tolerant, as are cucumber … Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. View the spore trap results and current downy mildew news. Monitor plants for symptoms of disease, especially from August through harvest. The cucumber downy mildew pathogen does not overwinter and the spores move via air currents. Fungicides are effective if applied before disease becomes severe. This year’s outbreak is much ahead of 2019’s first outbreak. University of Minnesota Extension discovers science-based solutions, delivers practical education, and engages Minnesotans to build a better future. Systemics are more effective if weather conditions are conducive to disease and the host is very vulnerable. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464).
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