Tag: downy mildew
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Reminders about Managing Cucurbit Downy Mildew with Fungicides
From Clemson Plant Pathologist Tony Keinath Cucurbit Downy Mildew This Fall Warm days and cool nights help create long dew periods in the fall, weather is ideal for cucurbit downy mildew (CDM) to start and spread, as reported in the Weekly Field Update – 9/15/25. We have not yet seen CDM in our fall sentinel…
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Weekly Field Update – 7/21/25
Another hot, humid week has passed. Growers are prepping fields for fall crops, and some planting has begun. As dry weather has set in, mites are becoming a problem in places. Disease pressure remains high in a variety of crops. See details below. Keep an eye on the Upcoming Events tab periodically so you don’t…
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Weekly Field Update – 7/14/25
It has been hot and humid around the state. Several thunderstorms have come through the state bringing some much-needed rain. Plenty of disease is present, including gummy stem blight, anthracnose, and downy mildew. Piercing/sucking insects are causing damage as well. See details below. Keep an eye on the Upcoming Events tab periodically so you don’t…
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Cucurbit Downy Mildew Fungicide Trial Report for Fall 2024: Part 1, Pickling Cucumber
From Clemson Plant Pathologist Tony Keinath In fall 2024, fungicide programs were tested on ‘Gershwin’ pickling cucumber to find out which programs worked best. Eight fungicide programs (plus a non-sprayed control) were used with various combinations of chlorothalonil (Bravo), Ranman, and Orondis Opti (Orondis + Bravo pre-mix). Cucurbit downy mildew (CDM) symptoms were noticed on…
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Field Scouting and Identification of Diseases on Cucurbits in South Carolina
From Clemson Plant Pathologist Tony Keinath For anyone who missed the Preplant Cucurbit Meeting on Feb. 7, 2025, at the Edisto Research and Education Center, here is a recap of the main points on scouting fields for cucurbit diseases. Table 1 shows which diseases are most likely to show up on different crops. Use this…
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Good Progress on Breeding a Downy Mildew-Resistant Pickling Cucumber, 2024 Update
From Clemson Plant Pathologist Tony Keinath I am part of an exciting collaboration with Dr. Michael Mazourek from Clemson University to help him complete the breeding and selection process for a new pickling cucumber with high levels of resistance to downy mildew. Field work at the Clemson Coastal REC in Charleston started last fall. We…
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Weekly Field Update – 6/10/24
Finally, a little rain fell around the state, though things remain fairly dry overall. Disease and insect pests are becoming more common as tomatoes, cucurbits, and sweet corn come to harvest. See details below. Keep an eye on the Upcoming Events tab periodically so you don’t miss anything. Also, check out the latest episode of…
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Cucumber Cultivar Response to Downy Mildew
From Clemson Plant Pathologist Tony Keinath This blog is an update on the preliminary cucumber cultivar reactions to downy mildew posted on June 16, 2023. Use the info in this blog to choose cultivars. Clearly, a few cultivars had temporarily “escaped” infection, although I don’t know how that was possible. In addition, the resistances originally…
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Weekly Field Update – 7/10/23
Check out the latest episode of the SC Grower Exchange podcast for an in-depth discussion on downy mildew with Extension Plant Pathologist Tony Keinath. Don’t forget about the Watermelon Field Day coming up this Thrusday (7/13) at the Edisto REC in Blackville, SC. Come and hear updates on watermelon research and taste some new varieties.…
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Question of the Week – Downy Mildew
This week, the question was: What is the disease showing up on the underside of this collard leaf? This is downy mildew. While downy mildew symptoms can be seen on the top sides of the leaves, the pathogen sporulates on the underside of the leaves. This disease is most common when we have foggy mornings…
The South Carolina Grower 