Late blight update

Late blight has been confirmed in several locations in Ontario recently. See the post from ONVegetables for more information.

While late blight is predominantly a problem on potato and tomato, specialty vegetable growers should be aware that tomatillo is also a potential host of this disease. Eggplant is not commonly been observed to be affected by late blight, however it is listed as being “occasionally mildly affected” by the disease. Specialty eggplant and tomatillo growers should be checking their crops for signs of this disease.

Note that not all fungicides registered on tomato can also be used on tomatillo. Always check product labels before applying to confirm that tomatillo is listed.


Tomato late blight has been confirmed in Chatham-Kent this week. Previous late blight confirmations this season have been in tomatoes in Essex and Elgin Counties and on potatoes in the Orangeville area.

See the late blight post from June 24 for fungicide recommendations for tomatoes in Ontario. Information for potato growers can be found in the July 13 post.

Please contact me if you think you are finding late blight. If possible, samples can be taken to submit for genotyping and research to help address this evolving disease issue. I can be reached at It’s helpful if you include photos of affected leaves (upper and lower surfaces), as well as stems and fruit if they are showing symptoms. See the tomato late blight photo gallery to review the symptoms.

Previous 2015 late blight posts: July 21, July 14, July 13, June 24

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