2), downy mildew in the untreated control plot was at about 60 percent for ‘Vlaspik’ and 35 percent for ‘Arabian.’ All fungicide treatment programs effectively limited downy mildew compared to the untreated control. Begin sprays before infection occurs to be effective. The active ingredient is propiconazole which is effective … This research was funded in part by the Agricultural Research Fund and the Pickle and Pepper Research Committee of Pickle Packers International, Inc., and by Project GREEEN GR12-020. To help growers determine the level of downy mildew threat, a monitoring system has been in place for Michigan since 2006. This site is a project of the Cornell Vegetable Program Work Team (PWT). Symptoms of downy mildew lower surface of cucumber leaf. There are some resistant cucumber varieties. Occurrence varies spatially and temporally year to year with movement of this wind-dispersed pathogen. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. Through our research, the pickling cucumber growers and allied industries will know in advance whether previously effective strategies have remained durable or if alternative products and strategies are needed. The downy mildew pathogen does not overwinter in Michigan or nearby states. Fungicides are the main management practice. Check out the MSU Viticulture Certificate Program! Once your plants have downy mildew, the best thing you can do is to try to eliminate moisture and humidity around the plants. … As a … Approximate total cost per acre per season, Zampro* -alternate- Previcur Flex* -alternate- Ranman*, Zampro* -alternate- Tanos* -alternate- Gavel, Ranman* -alternate- Tanos* -alternate- Gavel, Presidio* -alternate- Tanos* -alternate- Gavel, Presidio* -alternate- Tanos* -alternate- Ranman*, Presidio* -alternate- Gavel -alternate- Ranman*, Presidio* -alternate- Previcur Flex* -alternate- Zampro*, Presidio* -alternate- Previcur Flex* -alternate- Ranman*. Rotate with fungicides from different mode-of-action groups to reduce the risk of fungicide resistance development. For more information, visit https://extension.msu.edu. Product Overview Controls Plant Diseases-Liquid Copper Fungicide helps control powdery mildew, downy mildew, black spot, peach leaf curl,... Protection for Plants-Designed for use on listed vegetables, … Since we do not have a trap in each field or in each county, it is possible that an isolated spore mass coming into a particular region may be missed. Preventive fungicide sprays are recommended. July 2, 2014. The fungicide programs that included Presidio limited downy mildew to less than 8 percent. 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. Sprays were initiated at first true leaf and fungicide applications were applied by broadcast foliar sprays directed to the foliage. It is a copper-based fungicide. It reproduces via tiny, microscopic spores that act as seeds of the pathogen. 2). In the past, downy mildew spore numbers have been detected by the traps weeks prior to the confirmation of disease in each location. The spore traps alert growers to any influx of spores into Michigan’s production regions, but are not the only tools used to time fungicide sprays. Listen to Meg McGrath talk about managing downy mildew in a teleconference hosted by Steve Bogash of Marrone Bio Innovations on 17 June 2020. There have been outbreaks in Florida, North Carolina and South Carolina. Dial 515-604-9875. Fungicides may be applied on a 7-day schedule (only as consistent with the label), if necessary. Michigan cucumber and pickle growers have battled downy mildew, incited by the water mold, Pseudoperonospora cubensis, since 2005. Results from our research have identified a limited number of fungicides that are effective, but must be applied every five to seven days to control downy mildew on cucumbers when weather favors disease (Table 1). Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. Check out the MSU Agricultural Industries Certificate Program! Treatment and rate per acre, applied at 5-7 day intervals*Tank-mixed with 2 pt of Bravo WeatherStik. However, it won’t kill any of the disease that’s already gotten into the plant’s stems. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Symptoms of downy mildew on upper surfaces of cucumber leaves. This webpage also features current Extension articles about downy mildew, fact sheets for commercial growers and home gardeners, fungicide recommendations, photos of downy mildew-infected cucurbits and look-alike diseases, and links to other websites, including the MSU Enviro-weather Vegetable page, which also has pest management recommendations for cucurbit downy mildew and the Cucurbit Downy Mildew Forecast website. In May 2014, spore traps were placed in Monroe, Saginaw and Bay counties, and they continuously sample the air and collect spores into the trap. For all fungicides, thorough coverage of foliage is important in the control of downy mildew. (This is an estimate only. Fungicides for use against downy mildew can be categorized as either preventive or curative. In each year that we have trapped downy mildew, spores have been detected before the first case of downy mildew disease was confirmed. Please note that each downy mildew fungicide was tank-mixed with Bravo WeatherStik according to recommendations. Mary Hausbeck, Michigan State University Extension, Department of Plant, Soil and Microbial Sciences -
This article was published by Michigan State University Extension. At prompts enter 832191 for access code and 9 for reference number. The numbers of spores per day are uploaded to my “For Growers” webpage at www.veggies.msu.edu. At prompts enter 832191 for access code and 9 for reference number. Visit the, Downy mildew: Other symptoms and imitators, Cucurbit Downy Mildew Forecasting Program, Mobile fungicides for managing downy mildew and other major cucurbit diseases, List of biopesticides for organic production, Find your local Cornell Cooperative Extension office, Cornell Cooperative Extension Regional Commercial Vegetable Programs, NYS Integrated Pest Management Program - Vegetables, Controlled Environment Agriculture (CEA) Entrepreneur Conference Nov. 1-2, Curiosity and expertise earn Excellence in IPM award for Cornell ‘pumpkin whisperer’, Greenhouse/High Tunnel Vegetable IPM webinars start February 9. Once natural infection by downy mildew was confirmed in Michigan in late July, fungicide field trials were planted at the Southwest Michigan Research and Extension Center in Berrien County. Resistant cultivars are not currently available and fungicides have been the only effective means of controlling this disease. 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. In 2013, we tested fungicides, new and unregistered, for efficacy at low and high rates when applied alone or in a rotational program with other downy mildew fungicides; Table 2 lists the fungicides that were included in our research effort. Applied early on, it can stop downy mildew from colonizing a plant. New growth following … Southwest Michigan Research and Extension Center. Detailed information about downy mildew and its management are in the following articles and tables: © 2020 Cornell University. Overall, the weather in the Berrien County area was drier than other areas of the state and irrigation was needed. It is best for herbs, roses, fruits, and ornamental plants … This form is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Please contact site owner for help. Dr. Hausbeck's work is funded in part by MSU's AgBioResearch. Downy mildew fungicide trial cost for the 2013 field season when six sprays are applied. Certain fungicides can protect plants from basil downy mildew. Listen to Meg McGrath talk about managing downy mildew in a teleconference hosted by Steve Bogash of Marrone Bio Innovations on 17 June 2020. Alternate products and mix each with either: *Before downy mildew is confirmed in the area, products should be applied at seven-day intervals, and at five-day intervals after disease is confirmed. Wet weather favors downy mildew on cucumbers. In this trial (Fig. Leaf in the center is the leaf in the second image. The Hausbeck lab has been working to ensure that pickle growers will continue to have the most effective fungicide products available. These spores become imbedded on a sticky film that is removed and taken to the laboratory. Dial 515-604-9875. **These fungicides are especially effective under heavy disease pressure. A significant number of airborne downy mildew spores were detected on June 18, 2014 in the pickle-growing region of Bay County. Pathogen sporulation is below the yellow and brown symptoms visible on the upper surface (first image).