Tag Archives: Downy Mildew

Managing Basil Downy Mildew with Resistant Cultivars

Posted on April 28, 2026 by Sean Westerveld

Basil downy mildew was first identified in Ontario in 2010 and caused devastating losses in the first few years after its introduction (Figure 1). The disease often shows up in Ontario in late July or early August, and once in … Continue reading →

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Downy Mildew Identified on Hemp (Cannabis sativa) in Southwestern Ontario

Posted on September 22, 2020 by Sean Westerveld

By: Amy Fang Shi, Sean Westerveld, Jim Todd and Melanie Filotas Downy mildew of hemp (also known as cannabis downy mildew) has been identified in multiple hemp fields in southwestern Ontario. The disease first appeared in early September and was … Continue reading →

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Presidio Fungicide Registered for Basil, Hops and Edible-Podded Beans

Posted on November 27, 2018 by Sean Westerveld

By: J. Chaput, OMAFRA, Minor Use Coordinator, Guelph The Pest Management Regulatory Agency (PMRA) recently announced the approval of URMULE registrations for Presidio Fungicide for control of downy mildew on field and greenhouse basil and downy mildew of hops, and … Continue reading →

Posted in Culinary, Herbs, Hops, Hops Pest Management, Specialty Vegetable Pest Management, Specialty Vegetables | Tagged , , , , , | Leave a comment

Hop Leaf Stripping in Ontario

Posted on June 13, 2018 by Evan Elford

Leaf stripping (removing lower leaves and laterals; Figure 1) to increase air flow is a common cultural practice to manage hops downy mildew (P. humuli). Leaf stripping is performed earlier in Ontario than in other growing regions due to a shorter … Continue reading →

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2018 Downy Mildew Control Strategy for Cucumber Crops — ONvegetables

Posted on June 1, 2018 by Evan Elford

Specialty cucurbit growers may be interested in the following InfoSheet on downy mildew control strategies in cucumber crops written by Elaine Roddy, OMAFRA Vegetable Crops Specialist.  Note that not all products registered on cucumber for downy mildew are registered on all … Continue reading →

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Continue managing late season downy mildew in hops

Posted on July 28, 2017 by Melanie Filotas

As most growers are aware, downy mildew is extremely active in Ontario hops this year due to the ideal conditions for development of the disease.  For new growers, an article on identifying symptoms of this disease can be found in … Continue reading →

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