Author Archives: Sean Westerveld

About Sean Westerveld

Ginseng and Medicinal Herbs Specialist, OMAFRA

Fall Considerations for Lavender

Summer is winding down, but vegetative growth of the lavender will continue for another month or more. This is a critical time for lavender when it has recovered from flowering in July and is now putting on new growth that … Continue reading

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Basil Downy Mildew Confirmed in Ontario – July 31, 2019

Basil downy mildew has been identified in Norfolk and Prince Edward Counties in Ontario and is likely to be present elsewhere over the next week. Basil downy mildew is a highly destructive disease that can completely defoliate a plant within … Continue reading

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Think You Have a Root Lesion Nematode Problem in Your Ginseng? Think Again

We constantly get reports of significant root lesion nematode problems in ginseng, mostly based on the appearance of rusty symptoms and/or constrictions on roots. However, when ginseng fields are tested for nematodes beyond ginseng germination, we rarely can find any … Continue reading

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Managing Multiple Diseases at Once in Ginseng – Crop Update, June 20, 2019

This has been a challenging year for disease management in ginseng. In addition to the earlier issues with root diseases, especially Phytophthora, we are now dealing with high pressures of Alternaria (Figure 1) and Botrytis (Figure 2). It can be … Continue reading

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Managing Phytophthora Leaf Blight – Ginseng Crop Update – May 31, 2019

The persistent wet and cool conditions have resulted in very high risk of foliar Phytophthora. After the wet conditions last fall and this spring, there is a high amount of inoculum of Phytophthora in low areas in most gardens. When … Continue reading

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Fumigation Best Practices for Ginseng

This is the time of year ginseng growers prepare new land for fumigation. Based on the numerous trials OGGA and OMAFRA have conducted over the past 8 years on fumigation, proper preparation and sealing of the fumigant into the soil … Continue reading

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Managing Winter-Damaged Lavender

This past winter has resulted in significant damage to most lavender cultivars of both Lavandula angustifolia and Lavandula x intermedia (lavandins). Even plants that had row cover on them had damage. The damage to the top of plants is most … Continue reading

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