Black spots on tomato leaves

tpipAugust 2, 2012

My tomato plants have developed black spots on their leaves; see the photo. It started with the older bottom leaves, but now it seems to have spread to most of the leaves. The plants are growing in containers. I water them regularly, but have not used any fertilizer. The water is calcium rich. The tomatoes themselves seem fine, the first few are starting to develop a bit of color.

Should I be concerned? Is there anything that I can do? Using pesticides is not an option here.

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jean001a(Portland OR 7b)

This happened to me this year. (Or it was the first time I put 2 & 2 together and came up with 4!)

Water shortage 7 to 10 days ago. May have been very minor but enough to damage cells not against the veins. The spots will darken a bit, but will continue to function.

    Bookmark   August 2, 2012 at 1:39PM
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