I am quite sure by now that this is not late blight. Although these pictures
bear some resemblance to the appearance of a very early stage infection
the later developments are not the same and not as fast.
I believe the pathologists evaluations are pretty definitive. Additionally,
I mentioned phytotoxic effects as a possibility but do not really think that has happened.
One more thing I would like to know is whether the colonising of the leaf
surface by Serenade is visible and if so, what it looks like.
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