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. In the past, downy mildew spore numbers have been detected by the traps weeks prior to the confirmation of disease in each location. Preventive fungicide sprays are recommended. Note that fungicide costs will vary depending on current local pricing, specific products applied and the total number of applications.) The active ingredient is propiconazole which is effective … Spam protection has stopped this request. Sprays were initiated at first true leaf and fungicide applications were applied by broadcast foliar sprays directed to the foliage. BioAdvanced 701270A Effective Fungicide. This site is a project of the Cornell Vegetable Program Work Team (PWT). Detailed information about downy mildew and its management are in the following articles and tables: © 2020 Cornell University. Trials were arranged in a randomized complete block design with four replicates. 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. 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. Resistant cultivars are not currently available and fungicides have been the only effective means of controlling this disease. 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). It reproduces via tiny, microscopic spores that act as seeds of the pathogen. Southwest Michigan Research and Extension Center. The cost of using alternating programs of registered fungicides with a total of six applications for the 2013 field season was estimated (Table 3). 1). All other fungicide treatments showed some level of downy mildew with all treatments, keeping disease to less than 11 percent. Listen to Meg McGrath talk about managing downy mildew in a teleconference hosted by Steve Bogash of Marrone Bio Innovations on 17 June 2020. In this trial (Fig. This information is for educational purposes only. Treatment and rate per acre, applied at 5-7 day intervals*Tank-mixed with 2 pt of Bravo WeatherStik. Dr. Hausbeck's work is funded in part by MSU's AgBioResearch. 2). However, it won’t kill any of the disease that’s already gotten into the plant’s stems. To contact an expert in your area, visit, or call 888-MSUE4MI (888-678-3464). 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. This was a 17-treatment trial on ‘Vlaspik’ that included products applied alone at both a low and high rate (Fig. 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. 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. Applied early on, it can stop downy mildew from colonizing a plant. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This article was published by Michigan State University Extension. This was the only day in June with relatively high spore counts. Thank you, your email will be added to the mailing list once you click on the link in the confirmation email. To help growers determine the level of downy mildew threat, a monitoring system has been in place for Michigan since 2006. Certain fungicides can protect plants from basil downy mildew. Symptoms of downy mildew lower surface of cucumber leaf. Another trial was established in Berrien County where ‘Vlaspik’ and ‘Arabian’ cucumbers were treated with fungicide combinations/alternations (Fig. Fungicides are the main management practice. 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. Symptoms of downy mildew on upper surfaces of cucumber leaves. 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.