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% of the canopy showing infection.
All cucumber growers in Ontario are reminded to maintain an agressive preventative spray program to guard their crop against this disease. Spray a recommended downy mildew fungicide every 7-days. If possible, apply the fungicide before a predicted rainfall or irrigation event. The 2012 Ontario Downy Mildew Control Recommendations are posted at: bit.ly/ONcdm2012.
Scout all cucumber fields regularly to monitor for infection and assess the effectiveness of your spray program.