"It is a copper based fungicide ......and can be used right up to the
day of harvest."



Are you sure? I wouldn't be spraying copper based anything on my
grapes the day before harvest.


On Aug 27, 6:33*pm, "Paul E. Lehmann" >
wrote:
> Strongarm wrote:
> > I've had more problems with powdery mildew this year than any time
> > ever. *Anyone have suggestions for fermenting grapes that have been
> > hit hard with this fungus. *The worse ones have been Marichal Foch.
>
> > Tom
>
> I really have no experience fermenting grapes infected with powdery.
>
> I seem to have very good success by spraying with a product called Champ II
> I previously used a product called Tenncop which was very similar. *I get my
> products from the Maryland Grape Growers Association Cooperative pesticide
> purchase program.
>
> It is a copper based fungicide and contrary to Sulphur which is good only
> for powdery is good for both powdery and downy mildew. *It is a protectant
> and can be used right up to the day of harvest.
>
> This year I have also used Topsin for a pre-bloom spray and again post
> bloom. *It is a systemic and should be limited in use and follow the
> manufactures suggestions for maximum amounts per acre per year and number
> of sprays per year. *I think that getting good control pre-bloom and
> immediately post bloom makes a BIG difference for the rest of the year.
>
> I also think it is good practice to put down a post harvest spray or sprays
> to prevent an innoculum from building up in the vineyard that will become
> active again next spring. *A lot of growers quit spraying after verasion
> but I think it is best maybe to quit after verasion but begin again for a
> spray or two post harvest. *I know it is hard to do when all you really
> want to do is cellar chores.
>
> Paul