The other posters pose valid questions, but phylloxera is possible on
a labrusca, especially one that may have some vinifera in it. Quoting
Munson on p. 217 "...Labrusca is low in resistance and is much
weakened in clay soils, if infested, and Vinifera is entirely non-
resistant." I couldn't find the exact quote, but I think I have seen
elsewhere in Munson's book that he rated labrusca to have a phylloxera
resistance of 4 (out of 18 I think). Muscadines were 18 and vinifera
were zero.

On Nov 7, 12:04 pm, AxisOfBeagles > wrote:
> Agree with the prior poster - are you sure you have phylloxera? First,
> phylloxera attack the vines, not the grapes. If you have phylloxera,
> but still have grapes, the grapes should be fine. Your problem would be
> the mortality of your vines.
>
> What are the symptoms that cause you to suspect you have phylloxera in
> your vineyard? What part of the country are you in?
>
> Second - as the prior poster asked - are you sure you have Concord? As
> best I know, Concord is of the labrusca species - which is phylloxera
> resistant (phylloxera may be present, but to the best of my knowledge
> do not present a mortality threat to your vines).
>
> On 2007-11-07 08:26:46 -0800, said:
>
>
>
> > Well, it looks like my grapes are infested with grape phylloxera.
> > Since there's no known "cure" for this problem, I have to ask: are my
> > grapes even edible? Or does the whole vine have to be cut down and
> > burned? And if so, how long before I can re-plant (with resistant
> > rootstock)?
>
> > Thanks so much for your help.
> > Jeff- Hide quoted text -
>
> - Show quoted text -