![]() This is the disease most commonly confused for late blight because the pathogen causes large leaf spots, stem lesions, and affects fruit. Affected fruit develop large, brown, firm areas. When petioles are affected, the whole leaf can collapse. Large, dark brown lesions develop on stems and petioles, and sometimes the pathogen sporulates on these, too. The best place to look for the white fuzzy growth of spores is on the underside of leaf lesions. Characteristic leaf symptoms are very large spots, which look water-soaked at first then turn brown, often with a border of light green wilted tissue. Late blight can affect all parts whereas some of the ‘imitators’ cannot. The late blight pathogen produces most of its spores at night, so it’s usually more visible in the morning. The first step in diagnosis is to examine affected plants thoroughly for symptoms. Contact your local Cooperative Extension office for help. Unless you are able to conclude with great certainty that your plants do have one of the other maladies, get help by submitting a sample to a diagnostic clinic. ![]() The most common are below, and you can also view an entire online webinar presentation on the subject.Ĭlick on images to view more (and larger) images of the disease. ![]() (See Avoid the late blight blues.)īut before you pull up plants that have symptoms that look like late blight, make sure they aren’t one of the ‘imitators’! There are several diseases and disorders with symptoms that could be mistaken for late blight. Then spreading the word to others to be on the lookout. That means inspecting plants regularly and quickly destroying any that show signs of the disease. How to distinguish late blight from other diseases and disorders with similar symptomsīecause late blight is so highly contagious and destructive, it’s important to take an aggressive, community-wide management approach to nip any potential infections in the bud before the disease has a chance to spread.
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