Disease Late Blight Pest Management Tomatoes

US late blight reports

Late blight was found this week in at least two Pennsylvania counties.  Both potatoes and tomatoes were found to be infected.

Previous 2012 late blight update: May 31.

For Ontario growers:

Late blight has not been found near Ontario, so these US reports are not of immediate concern.  It is important to scout your tomato fields regularly and know the symptoms of late blight.  Refer to Late Blight Look-Alikes for photos of late blight and possible look-alikes on tomato.  Remember that conventional tomato growers who are applying fungicide with their bacterial disease sprays or later, have initiated the fungicide program for early blight, septoria leaf spot, and anthracnose, are also protecting the crop from late blight infection.

Past OMAFRA articles on tomato late blight are found under the late blight tag to the right.  Please report any occurrences so that we can keep the tomato community informed about its development and spread and so that we can collect samples to learn about the strains, fungicide sensitivity, and the biology of this evolving disease.

Contact OMAFRA at 519-674-1690 or janice.leboeuf@ontario.ca if you suspect you have found late blight in Ontario. Those in the US can contact their state cooperative extension service or report online at http://www.usablight.org/.

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