Duane,
I have seen this before, but I am still clueless as to what may be causing it. A few years back I concluded it was 'environmental', as it did not seem to spread around, but I cannot be sure. This only happened to me for container-grown plants. So maybe stress-related or fertilizer-related issue?
Would be interesting to hear other theories about what this may be.
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 Tatiana's TOMATObase
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