Late blight was found in southwestern Ontario potatoes (Elgin County) and field tomatoes (Kent County).
A brief update on late blight confirmations in Ontario, Canada, as summarized by Dr. Kutay Ozturk, Extension potato pathologist with the University of Maine:
“The strain on the potato infection was found to be US-23. This strain is highly aggressive on tomatoes (foliage and fruit) and potato tubers but less so on potato foliage. On tomatoes, US-23 produces much more sporangia than any other strain, which can be easily spread by wind.” Please see the links below for more information:
https://onvegetables.com/2024/07/03/late-blight-update-14/
https://onvegetables.com/2024/07/05/late-blight-update-15/
This information was shared with MPIC by Dr. Jaime Willbur of the Michigan State University Extension.
If anyone has questions on late blight, e-mail her at willbur1@msu.edu.