Tag Archives: Diseases

Ginseng Crop Update – Diagnosing Unusual Foliar Symptoms – July 10, 2026

Posted on July 10, 2026 by Sean Westerveld

The hot conditions over the past two weeks can obviously stress ginseng. Each hot day likely reduces yield as the plant virtually shuts down in the heat of the day. A University of Guelph study in the past showed that … Continue reading →

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Lavender Crop Update  – Things to Monitor During Bloom – July 9, 2026

Posted on July 9, 2026 by Sean Westerveld

Lavender is in full bloom across the province. Bloom was late to arrive this year, but may progress faster than normal due to the above-normal temperatures. Although growers are focused on many activities at this time of year and the … Continue reading →

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Ginseng Crop Update – Avoiding “Heat” Stress – June 11, 2026

Posted on June 11, 2026 by Sean Westerveld

Rainfall has been highly variable over the past few days. Based on CoCoRaHS observations (https://maps.cocorahs.org/) and local rain gauges, rainfall ranged from 30+ mm from a line north of about Langton to Simcoe to 0 mm closer to Lake Erie, … Continue reading →

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Lavender Crop Update – Winterkill and Pest Update – May 22, 2026

Posted on May 22, 2026 by Sean Westerveld

Winterkill By now, lavender plants should have fully greened up. If the outer portions of the canopy are still brown, the plant will only recover if new shoots are now visible lower on the branches or near the crown. Green-up … Continue reading →

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Ginseng Crop Update – Frost and Pests – May 22, 2026

Posted on May 22, 2026 by Sean Westerveld

Weather, Frost and Disease Some areas have experienced frost damage, mostly during last week’s frost events. Most of the damage is confined to field edges and low areas. We used to think that damage along field edges was due to … Continue reading →

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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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