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Bibb Lettuce necrosis

Posted by FredLee none (My Page) on
Fri, Nov 22, 13 at 19:34

My bibb lettuce has some necrosis on some leaves. I don't see any pests.

Any suggestions as to what this may be?

It's being grown in a greenhouse with temps around 70F

Follow-Up Postings:

RE: Bibb Lettuce necrosis

Looks like an over-mature leaf.
What does the rest of the plant look like?

RE: Bibb Lettuce necrosis

Possibly caused by Downy mildew
Pathogen: Bremia lactucae

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