Cucurbit Downy Mildew-Confirmed in Henderson County July 20, 2018
Downy Mildew Management Sprays!
Downy Mildew symptoms first appeared in Henderson County on July 20, 2018 and was confirmed by Extension Plant Pathologist, Inga Meadows.
Henderson County has several acres in cucumbers, squash, zuchinni, and pumpkins, therefore growers are strongly encouraged to start scouting for downy mildew to ensure early detection.
See adjacent photos of leaf symptoms Before the disease appears apply fungicides at 7-day interval for cucumbers and 10-day intervals for other cucurbits. For example, before disease detection you can use: Tanos + Bravo, alternated with Zampro + Bravo, alternated with Gavel every 7 to 10 days in rotation.
Upon detection, growers should use intensive spray programs every 5-7 days, especially if weather conditions are conducive (wet and cool). P. cubensis can become resistant to fungicides quickly and it is important to alternate products and tank mix with with mancozeb or chlorothalonil upon every application. For example, after disease you can use: Ranman + Bravo, alternated with Previcur Flex + Bravo, alternated with Orondis Opti A + Bravo every 5 to 7 days in rotation.
For more information about the disease and how to control it see our Cucurbit Downy Mildew Fact Sheet.
To track this disease follow the Cucurbit Downy Mildew Epidemic Status Map.