Late blight confirmed in south central Pennsylvania Check the CDM ipmPIPE website for the latest information about confirmed reports. If you suspect downy mildew on your farm, please let me know either by email at or by phone at 81 or contact your local Extension Office. Since downy mildew disease forecasting is an important tool utilized by growers, extension educators, crop consultants, and other industry stakeholders, confirming reports especially early in the season and on different cucurbit crops is important at both a local and regional level. In fall 2017, Valent received a federal registration for Elumin (ethaboxam, FRAC 22) which is labeled for oomycete diseases on cucurbits, ginseng, pepper, eggplant, and tuberous and corm vegetables. The latest resistance management recommendations can be found electronically. For resistance management, rotate between FRAC code groups and tank mix with a protectant fungicide. See the 2018 Mid-Atlantic Commercial Vegetable Production Recommendationsfor a complete list of recommended products. There are more product options for non-organic production including Orondis Ultra (U15 + 40), Orondis Opti (U15 + M5), and Ranman 400SC (21) which can be rotated with Previcur Flex 6F (28), Zampro 525SC (40 + 45), Zing! 4.9SC (M5+ 22). It is recommended that all organic cucumber crops be under some type of protectant spray program at this time. Zonix is an OMRI-approved rhamnolipid surfactant which has shown some efficacy when included in a regular spray program. Other organic options include the microbial biopesticides Actinovate, Double Nickel 55, Serenade, and Sonata as well as the biochemical biopesticides MilStop, Organocide, Oxidate, Regalia, Sporatec, and Trilogy. Copper-based products are still the primary tool but can also cause phytotoxicity on some cucurbit crops. Organic management of downy mildew is more challenging. Conventional growers in eastern Pennsylvania closer to the sources in Jersey and Maryland may want to consider including a downy mildew specific fungicide in their spray program especially as we break out of this hot weather cycle towards the end of the week. At this time, protectant fungicides are recommended for growers in the central and western parts of Pennsylvania, if not already being used. Purple spores of the pathogen on the lower leaf surface of a cucumber. Photo: Beth Gugino, Penn Stateįungicides are an important tool for effective control. Sources of the disease are continuing to build in the southeastern US, but the current weather patterns are favoring more local spread rather than a long-range spread of the disease to the mid-Atlantic region. Current disease forecasting puts parts of eastern Pennsylvania at low risk for potential spread from these sources over the next several days. Thanks to a good scouting and fungicide program in commercial pickling cucumber fields in Maryland there have been no new reports since mid-June. This is the second report in the region this season. Monday, July 2, downy mildew was confirmed in a commercial cucumber in southern New Jersey just south of Philadelphia. This is the same genotype that has been predominant on both tomatoes and potatoes across the region for the past four years. Samples collected from York County have been determined to be caused by Phytophthora infestans genotype US23. Late blight has been confirmed on tomatoes in York County and on potatoes and tomatoes in southern Lancaster County. Sources of the disease are continuing to build in the southeastern U.S., but the current weather patterns are favoring a local rather than long-range spread of the disease to the mid-Atlantic region. Downy mildew has most recently been confirmed on cucumbers in southern New Jersey and Maryland.
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