Plant & Pest Advisory
Vegetable Alert!
Date: 5/30/12 Alert Author: Andy Wyenandt
Pest: Cucurbit downy mildew
Found: Cucurbit downy mildew has been confirmed on cucumber in areas near Swedesboro/Glassboro (Gloucester County). This is the first report of cucurbit downy mildew in the mid-Atlantic region this year.
Pest: Cucurbit downy mildew
Found: Cucurbit downy mildew has been confirmed on cucumber in areas near Swedesboro/Glassboro (Gloucester County). This is the first report of cucurbit downy mildew in the mid-Atlantic region this year.
Crop(s) at risk: all cucurbit crops in
Potential impact: Significant losses will occur if not controlled properly
What growers should do:
Control of cucurbit downy mildew begins with regular scouting, recognizing symptoms and weekly protectant fungicide applications. Now that downy mildew has been detected growers should scout on a daily basis and add a downy mildew specific fungicides to regular fungicide program. As a note, powdery mildew is also active in cucurbits.
Remember, all abandoned cucumber and summer squash fields should be sprayed with gramoxone or disced under immediately after last harvest to kill the foliage! Abandoned fields left unattended after use will only serve as a source of inoculum for other fields once downy mildew makes its way into our area.
Please see the 2012 Commercial Vegetable Recommendations Guide for
specific fungicide recommendations
To track the progress of cucurbit downy mildew in the eastern US and to keep up with reports of Downy mildew from other states please visit North Carolina State University’s Cucurbit Downy Mildew Forecasting Center at http://www.ces.ncsu.edu/depts/pp/ cucurbit/.
If you suspect downy mildew on your farm, please contact your county agent or Andy Wyenandt (856) 455-3100 ext 4144.