Basil downy mildew has been reported from a basil field in southwestern Ontario. Initial infection probably occurred within the last 2 weeks. Over the past five years, the average first report has been around August 1. Conventional basil growers should be applying preventative fungicides on a regular basis. Torrent, Revus and Confine Extra are registered for control of basil downy mildew. These should be applied in a rotation to prevent the development of resistance. Consult to product label for detailed application instructions. Products registered for herbs are listed in the Vegetable Crop Protection Guide – OMAFRA Publication 838.
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