Late Blight - Cornell University - Long Island Horticultural Research & Extension Center

Late blight on tomato foliage

Late Blight - Cornell University

Late blight lesion on tomato stem

late blight on potatoes

Late blight on potato tuber

Late Blight Update

UPDATE-- August 18, 2022

Late blight reports in the US remain very limited and only in the south.  Looks like we will make it through the season with no late blight!

Late Blight is a serious disease of tomatoes and potatoes.  Check here weekly for an update on the disease--the more you know, the more you can take steps to keep this deadly disease in check.

To learn more about late blight disease, click here

To manage late blight, check out this factsheet:  Click here

To find late blight resistant tomato varieties,  click here

To find where late blight is in the United States, check out and scroll down for the occurrence map.

Check out this discussion of how to manage late blight:  click here

There are a lot of late blight "look alikes" -- here is how to figure out what you have:

Late Blight FAQs  click here


Barb Neal
Agriculture Agent and Horticulture Educator
607-223-2753 or 607-793-6414 during business hours

Last updated August 18, 2022