VASCM: Pre-bloom cluster issues

[Dustin Moore]

It does look like Bunch stem necrosis but BSN is not used during this time
of the year to describe death of fruit or rachis in the cluster. BSN is an
unknown problem in grapevines and happens during the beginning of veraison
and it is unknown what the exact cause is. The belief is that it’s from
possible poor previous years nutrition or bad pruning practices but like I
said, that happens right before or during veraison, not in Spring. Only
reason you would have death of cluster during this time of the year is due
to early onset of botrytis. With the wet weather like we had this would be
my assumption.

Did you have any leaves that look like this? This would be one sign but
like I tell everyone that I give advice about vines to is that you really
need to be a detective. Problems in the vineyard can look like many
different things/problems since many issues looks very similar. I would
have to take everything into account such as nutrient program, vine health,
current growing conditions and anything else I can think of to make an
informed guess and thats what any viticulturist should tell you. You can
never be 100% Positive unless there was a lab test for it available, which
there is not.

On Mon, May 25, 2020 at 12:00 AM Ken Swegles <rhizosviticulture at gmail.com>
wrote:

> This looks like a bunch stem necrosis,
>
> *Ken Swegles*
> *Viticulturist*
> Rhizos Viticulture LLC
> PO Box 66126
> Scotts Valley, CA 95067
> (831) 454-6045
>
>
>
>
> Sunday, May 24, 2020, 12:44 PM -0700 from elysiumbvi at msn.com <
> elysiumbvi at msn.com>:
>
>
>
>
>
>
> Does anyone know why the rachis (I believe that’s what it’s called) would
> be dying in near the end of the cluster of our Chardonnay? Bloom has just
> started and it’s happening to about 20% of the clusters. Thanks for your
> help.
>
> Ken Challenger
> Sent from my iPhone
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