Downy mildew

  1. Photo of tomato plants with green tomatoes and green and brown dying leaves. Photo by Chris Smedley.

    Late blight and downy mildew uptick in veggies

    Aug 11, 2017

    Late blight has been confirmed on tomatoes in Wayne and Ashland counties this week.  We also found downy mildew in basil, cucumber and melons in our sentinel plot in Fremont, OH.  

    Downy mildew is assumed to be widespread on cucumbers and melons in Ohio, but we have not yet found downy mildew on squash or pumpkins. The late blight and downy mildew pathogens are related and all are favored by moderate temperatures, rain, high humidity and cloudy skies.

  2. Photo of a green cucumber leaf infected with yellow spots of downey mildew.

    Cucumber downy mildew confirmed in Delaware and Franklin counties

    Aug 7, 2017

    Cucumber downy mildew was confirmed in Delaware and Franklin counties this week. Cucumber and melon growers in northern and central Ohio should assume that downy mildew risk is high and should protect their plants with fungicides. Since downy mildew has also been reported on cantaloupe and cucumber in Kentucky (Lexington area), it is likely that theses crops are also at risk in southern Ohio. See links to fungicide recommendations here:

  3. Photo of a leaf infected by downy mildew.

    Downy Mildew Confirmed in Ohio Cucumbers

    Jul 21, 2017

    Downy mildew was confirmed on cucumber leaves from a commercial farm in Wayne County, OH on Wednesday June 28 and the next day in Monroe County, MI. This follows the first confirmed case in Ontario (Essex County) on June 27.