Online presentations about late blight

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

There are a couple of recently recorded presentations about late blight available online.

Dr. Willie Kirk, Michigan State University Plant Pathologist, has a presentation online at  Bayer has a segment at the beginning on some of their US fungicide registrations, but that ends at about 5:00 on the progress bar at the bottom left of the window.  Dr. Kirk gets rolling at about the 6:25 mark (you can slide the indicator on the progress bar back and forth to jump to a different part of the presentation or hear something again).  This presentation is about 1 hour long.

Dr. Sally Miller from Ohio State University and Dr. Meg McGrath from Cornell University delivered an online seminar on “Late Blight Management on Organic Farms” on July 1.  The recording of the webinar is not online yet as I write this update, but some of the resources have been posted at  The recorded seminar should be available sometime in the next week.  It runs about 1 hour and 15 minutes.

Of course, keep in mind that some fungicides that they mention are not registered for the same uses in Canada.  However, there is a lot of useful information on late blight biology and management in both of these presentations.

Late blight update

There have been no confirmed cases of late blight to date in Ontario.

The late blight infected potato field detected in Michigan on June 21 was burned and disked very quickly.  No late blight symptoms were found in surrounding fields.  As previously reported, late blight has also been found in east-central Ohio and northwestern Pennsylvania, as well as in several states further south.

Weekly updates about late blight in New York and the contiguous states and Canadian provinces can be found at

A model predicting favourable weather conditions for late blight infection in North America can be found at:  This only indicates favourable weather conditions, and not the presence of the pathogen.  Without late blight inoculum, the disease will not develop even in highly favourable conditions.

You can click on a “pin” on the map to get more details and customize the information.  The environmental conditions within an individual field may differ from the macro level conditions reported here.

A new online format for the Vegetable Crop Update (Tomato and Pepper)

The Vegetable Crop Update (Tomato and Pepper Edition) is now available in an alternative online format at

At, you can view articles by date or by topic.  You can subscribe for e-mail alerts or RSS feeds.  The sidebar also shows recent updates from ontariotomato on Twitter and current conference and event listings for Ontario agriculture.

You can still access the updates in the older online format at  The online subscribe feature at this page is still active.  You can also still subscribe to receive the pdf format by e-mail (contact me as indicated at the end of the update).  Faxed and mailed updates are still available as well.

ONvegetables provides you with an alternative method of accessing the updates in a more user-friendly and mobile-friendly format.  We are interested in your feedback.  Let us know what you think of the new format.

Southwest Crop Diagnostic Days

Southwest Crop Diagnostic Days are coming up in Ridgetown July 7 and 8.

Highlights of interest to tomato and pepper growers include:

  • Nematodes Unearthed – Discover which ones are working with you and against you (with Dr. George Bird – Nematologist, Michigan State University)
  • Moving Soil – plow, disc or chisel – They all move soil. What is the impact on the field and the crop?
  • Growing Bio-Energy Crops in Ontario – Tackling the challenges of producing the crops here
  • Vines that Entwine – Identifying the vine weeds of Ontario

Pre-registration is required. Due to the large expected enrollment, we will be offering the program on two separate days. Registration will be limited to 200 registrants per day. The program will be the same for each day.  The cost for the day is $95.00 per person (HST included).  This includes the program, lunch, refreshments and an information package.

For more information or to register, visit the Southwest Crop Diagnostic Days website.

Minor use label expansion granted for Rimon 10EC insecticide for management of caterpillar pests of peppers

J. Chaput, OMAFRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently announced the approval of a minor use label expansion for RIMON 10EC Insecticide for control of European corn borer on field peppers.  RIMON 10EC (novaluron) was already labeled for management of several insect pests on apples and potatoes in Canada. Continue reading Minor use label expansion granted for Rimon 10EC insecticide for management of caterpillar pests of peppers

Information for commercial vegetable production in Ontario