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Sarge
 
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"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?