Mathew,
In my experience one of the major negatives
to spraying right up to harvest is the residue form the CT may discolour the
grapes. This can be avoided by using less Humic acid and perhaps fulvic instead
(thus less brown residue). Also if using fish in the CT and it is not completely
used up this may taint fruit. So it depends on how much "stuff" is in the
AACT.
From what I understand the microbes are not a
problem and we confirmed this spraying about 2 weeks prior to harvest
last year.
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