Fruit & Vegetable Magazine

Features Production Research
Downy mildew confirmed in Ontario


July 5, 2011
By OMAFRA

Topics

downymildewJuly
5, 2011, Ridgetown, Ont – Downy mildew is present in a pickling cucumber field
in Kent County, Ontario. A field scout, funded by the Ontario Processing Vegetable
Growers, collected the infected leaves.

July
5, 2011, Ridgetown, Ont – Downy mildew is present in a pickling cucumber field
in Kent County. A field scout, funded by the Ontario Processing Vegetable
Growers
, collected the infected leaves.

The
infection is currently isolated to one small area of the field, close to a
woodlot. At present there are approximately four to five lesions per
plant.  Sporulation is apparent on
the underside of the leaf, indicating that the infection occurred within the
last week.

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downymildew 
  

All
cucumber growers are advised to adopt an aggressive fungicide strategy
immediately. Consider all cucumber crops to be at a high risk of infection.
Apply downy mildew targeted fungicides at a seven-day spray interval. Use ample
water volumes (ie: 30 gal/ac) to ensure adequate coverage. Where possible,
apply fungicide prior to a rainfall or irrigation event.

The
targeted downy mildew fungicides include Ranman 400SC, Tattoo C and Presidio.

For
the full 2011 Downy Mildew Control Strategy, click here.

Copies
are also available from the OMAFRA Contact Centre, 1-877-424-1300.