Author Archives: Sean Westerveld

About Sean Westerveld

Ginseng and Medicinal Herbs Specialist, OMAFRA

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

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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Ginseng Crop Update – Dealing with Early Senescence, August 28, 2020

Given the major stresses experienced by the ginseng crop this year, including early frost damage, hot and dry conditions, and high Alternaria pressures, many gardens are senescing early this year. There are a few things to consider for proper management … Continue reading

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Lavender Crop Update – Late Summer Management – August 21, 2020

August to October is the time lavender plants recover from the bloom period and put on new growth. August is the best time to fertilize plants and prune. Now that we are getting closer to the end of August, pruning … Continue reading

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Miravis Duo Fungicide Registered for Use on Ginseng and Hazelnut

Syngenta Canada has recently announced that the Miravis Duo fungicide label has been expanded to include the control of Alternaria blight of ginseng and eastern filbert blight of hazelnut, in addition to many other horticultural crops. Miravis Duo consists of … Continue reading

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Basil Downy Mildew Confirmed in Ontario – July 28, 2020

Basil downy mildew has been confirmed in a home garden in Norfolk County. The symptoms first appeared in the past days, which means infection probably occurred over a week ago. It is likely that the disease is present in most … Continue reading

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Rainfastness of Fungicides

Ginseng and other specialty crop growers may be interested in this post from ONfruit on rainfastness of fungicides: Timing fungicides can be a challenge.  Infection for most diseases requires rainfall.  Fungicides are used mostly protectively so work best if applied … Continue reading

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