Need help identifying spots on basil

mbritton1September 24, 2010

Hi all,

I've been noticing that some of my container plants are dying (chiefly basil, but also parsley and an early jalapeno plant), apparently from spots on the leaves. The spots are clear, grey, and brown, and in the worse cases, the top and bottom of the leaf are covered in black and white specks, some of which I also see in the soil. Eventually, the leaves fall off. The disease seems to be spreading from container to container.

See the attached link (an imageshack picture of a diseased plant).

I see some small insects buzzing around my plants, which I believe are fungus gnats (?), but I'm not sure if they can cause this. Any help is greatly appreciated.



Here is a link that might be useful:

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taz6122(N.W. AR.6b)

What kind of soil did you use?

    Bookmark   September 24, 2010 at 11:56PM
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No fungus gnats won't cause this kind of damage. I don't believe it's a disease or soil related either. It looks typical of the damage caused by chafing/rasping insects. The 'spots' start out light or clear because the tissue containing the chlorophyll is damaged. It turns brown upon tissue death.

    Bookmark   September 29, 2010 at 11:09PM
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rhizo_1 (North AL) zone 7

Looks like thrip damage to me, and the little flying things could be them.

    Bookmark   September 30, 2010 at 4:33AM
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