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Black specks on basil, morning glory, grape

Posted by SquirrelFarts ME (My Page) on
Sat, Jun 22, 13 at 11:38

I've done a lot of looking and can't find a definitive answer as to what exactly this is attacking my plants. It seems to go for tender leaves, as it's hit my sweet basil, mint, morning glories, and concord grape leaves. Presents as tiny black specks on the underside of leaves, which eventually seem to drain/yellow the leaf causing holes and eventually leaf drop. Can anyone tell me what this is and/or how to treat? I've seen explanations ranging from powdery mildew, fungus, some sort of bug/parasite... need help to pin this down. See pictures.


Follow-Up Postings:

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RE: Black specks on basil, morning glory, grape

Do these specks wash off?


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RE: Black specks on basil, morning glory, grape

They do seem to wash off with a mild scrub... they don't just rinse away. The damage to the leaf remains.


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RE: Black specks on basil, morning glory, grape

On basil, could be downy mildew.

Please post another image (the top leaf surface) and of an entire plant with the problem

Edit:
Also please post images of the other plants as it may be several different things.

This post was edited by jean001a on Sat, Jun 22, 13 at 14:18


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RE: Black specks on basil, morning glory, grape

Here is an overall picture of the basil. Damage to the upper leaf surface can be seen. I had a couple basil plants die off a few months ago with similar symptoms, so I'd like to avoid losing this one.


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RE: Black specks on basil, morning glory, grape

The morning glories seem to be particularly susceptible to this as well. Here's a good indication of the damage:


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RE: Black specks on basil, morning glory, grape

Possible on basil,but I'm not certain.

Review this info from Cornell to see if it's a match
http://vegetablemdonline.ppath.cornell.edu/NewsArticles/BasilDowny.html

The morning glory looks different. Perhaps environmental.

I'm curious; are you growing the plants indoors or outdoors?


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RE: Black specks on basil, morning glory, grape

The basil is outside, but the morning glories are indoors. The grapes and mint are also outside. I had assumed that it was the same thing attacking all these, but that might not be the case.


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