Page 43 - Grapevine July-Aug 2020

Around The Vineyard

being tested at the
nursery. Related to
nursery certified plants,
the rules are vague and
state that these plants
may be tested (particu-
larly if after inspection
suspected symptoms
are observed).

According to CDFA,
the goal is to test a
statistical sample with
a 95% confidence level
assuming a 1 % disease
incidence. It is disap-
pointing that in spite of
the importance of the
decline and canker dis-
eases caused by fungal
pathogens (and how
easily the pathogens can
be transmitted by activ-
ities carried out at the
nursery), the regulations
do not include inspec-
tion or testing for fungal

Newly planted vineyard pathogens in mother or
increase blocks.

In the past few years, the Russell Ranch foun-
dation block became progressively infected with
GRBV. The infection status is so high that last year
FPS suspended the sale of plant material to nurs-
eries. I will not elaborate on this issue as I have
recently written about this topic.

Obviously, in spite of the limitations of the R&C
program mentioned above, the use of certified
material is expected to be less risky than plant-
ing field selections of unknown infection status.
However, it is always prudent to consult with me to
assure that the planting material meets the expect-
ed cleanliness standards.

An important piece of advice when working on
the procurement of clean planting stock is to plan
in advance. Most nurseries in California collect
cuttings for bud wood as soon as the vines are dor-

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