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 confirmed through microscopy and genetic tests to be caused by Pseudoperonospora cannabina. All growers of hemp (Cannabis sativa) should watch out for this disease, although the impact of the disease may depend on the end use. Continue reading

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UPDATE – Ontario Hoppenings Lunch and Learn – Monday September 28, 2020 now from 11:30 am to 1 pm

Monday,September 28, 2020 11:30 am – 1 pm (earlier start time)

Our monthly Ontario Hoppenings webinar has been extended by a half an hour to accommodate both the increased interest in several hop-related topics and the availability of our guest speaker, Kristen Obeid. The session will now start at 11:30 am instead of noon and will run until 1 pm. Registrants who are unable to join earlier will still be able to join at noon and slides presented earlier can be emailed later.

If you have already registered for the session, the new agenda will be emailed to you. If you have not registered, registration information can be found at the bottom of this post.

An updated agenda is below.

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 of these gardens: 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 and nitrogen applications should soon wrap up. Nitrogen applied any later than now could lead to too much vegetative growth in the fall and reduce hardiness overwinter. 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 two new actives for ginseng and hazelnuts: adepidyn (pydiflumetofen) (FRAC Group 7) and difenoconazole (FRAC Group 3). Continue reading

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Ontario Hoppenings Lunch and Learn – Monday September 28, 2020 at Noon

Ontario Hoppenings – OMAFRA Monthly Hop Update and Discussion

Monday,September 28, 2020 noon – 1 pm

Join OMAFRA specialists Evan Elford and Melanie Filotas on Monday, September 28 at noon for an online Zoom discussion about Ontario hops. Evan and Melanie will give a brief overview of the 2020 season as well as considerations for fall hopyard activities. Additionally, Kristen Obeid, OMAFRA’s Weed Management Specialist for Horticulture will join the meeting to answer questions about herbicides and weed management for hops.

Attendance is free and open to anyone, however you must pre-register to get the meeting log-in details.  Anyone wishing to ask questions in advance can email Evan ( or Melanie ( by 8:30 am on September 28,  or enter it in the question field when you register, and we will try to answer during the session.

Register in advance for this meeting:

After registering, you will receive a confirmation email containing information about joining the meeting.

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