"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.