Jeff Chorniak wrote:

> A puzzler. Two things have happened to my cab franc vines within the last
> weeks. A week or so after topping shoots, I am suddenly noticing a
> potassium deficiency in old leaves. I am assuming it may be because I
> topped too much from new growth and the vine is translocating nutrients
> from older leaves. Am I correct?
>
> Secondly, I am noticing that new lateral growth on the upper canopy is
> flowering again on a few vines. Nice tight baby clusters.
>
> Are both phenomenon related in some way?
>
> I've checked "General Viticulture", "Biology of the Grape Vine", and "The
> Production of Grapes and Wine in Cool Climates". In all three publications
> I haven't found any direct references to translocation of potassium as a
> result of summer pruning. Nor have I seen reference to late (August)
> flowering.
>
> Baffled.
> Jeff

Jeff, I do not know anything about possible potassium translocation but I
have found it common in my vineyard to have laterals that result from
hedging produce new clusters. I do not use them in my wine production and
in fact should probably drop them because I assume they are just using
energy that the vine and other clusters need.