Fruit & Vegetable Magazine

Features Production Vegetables
Downy mildew identified in Elgin County

July 4, 2012  By OMAFRA

Example of downy mildew symptoms on a cucumber leaf.

July 4, 2012 – Downy mildew was confirmed in a pickling cucumber field in Elgin County on July 3rd, 2012. The level of disease in this field is significant with up to 20 per cent of the canopy showing infection.

All cucumber growers in Ontario are reminded to maintain an aggressive preventative spray program to guard their crop against this disease. Spray a recommended downy mildew fungicide every seven days. If possible, apply the fungicide before a predicted rainfall or irrigation event. The 2012 Ontario Downy Mildew Control Recommendations are posted at:

Scout all cucumber fields regularly to monitor for infection and assess the effectiveness of your spray program.


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