Author Archives: Sean Westerveld

About Sean Westerveld

Ginseng and Medicinal Herbs Specialist, OMAFRA

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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Early Season Management of Phytophthora in Ginseng

After a very wet late summer and fall last year, Phytophthora root rot probably had a chance to spread within low areas of ginseng gardens. Combined with the wet conditions we are currently experiencing, management of Phytophthora leaf blight and … Continue reading

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2019 IPM Workshops Now Offering CEU Credits

The following FREE workshops are now offering CEUs to Certified Crop Advisors. Sign-up sheets will be available at each session. These workshops are for those who will be scouting horticultural crops this year or looking to refresh their IPM knowledge. To … Continue reading

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