"J F" > wrote in message
...
>
> "Sarge" > wrote in message
> news
> > I encountered an H2S problem when I made wine from chardonnay grapes
that
> > were sprayed with sulfur. The sulfur residue could be seen on the
grapes.
> > Of course the H2S may have been caused by some other reason and the
> problem
> > was resolved by aeration.
> >
> > I wonder how a spray program of sulfur and copper could affect
winemaking.
> > Does residual amounts of sulfur on grapes contribute to free SO2 and H2S
> in
> > wine?
> It can contribute to H2S in your wine but most vineyards stop spraying
> sulphur weeks before harvest for this reason.
>
In a bad season they may have to spray closer to harvest. Also what if it
doesn't rain after the last spray, would some sulfur still be on the grapes
at harvest?