Mancozeb probably came in the form of a wettable powder or a flowable (a
prewetted powder) these formulations usually use a talc or a clay as a
carrier. The chemical its self is boken down in time by sunlight and heat.
What you are seeing is most likely the carrier residue.
"Ken Anderson" > wrote in message
...
> The Mancozeb I use can't be applied 63 days before harvest. Yet when I
> was
> picking my grapes, I could still see the yellow residue on the bottom of
> the
> grapes. It was where the original drop formed and dried. Seemed to have
> just
> stayed stuck there. So does the 63 day rule indicate that, although the
> fungicide still appears to be present, it's actually now inert and
> harmless?
> Or does it mean our government bureaucracy may have yet bungled again? I
> suspect the latter, but have also read that Mancozeb has low toxicity.
> Hopefully they've got THAT right.
> Ken
>
>