PCC Sep Oct 2019

Photo 3. Vines affected by black foot disease. Left: scorch symptoms.
pearance during winter. In early spring
reproductive structures of the pathogen
are visible as black speckles.
Impact
All the described trunk diseases can
be seen at any time of the vineyard
life, but normally they start to appear
between the third and the fifth year after
planting. They can appear alone, or in
combination, which can exacerbate the
plant stress. In general, by year 10 to 12,
20 percent of the plants show symptoms
when no preventive actions have
been implemented. At this point, trunk
diseases enter in an exponential phase,
reaching 75 percent of infection by year
15, and 100 percent by year 20.
Significant losses are associated with
Trunk Diseases Development
100
80
trunk disease development. Reduction
in number of clusters, decrease
in quality and cosmetic damages are
the most visible impacts in the field.
However, cost of replanting, and/or
retraining if grower elects to use vine
surgery, especially in young vineyards,
it also a major cost
associated with trunk
diseases. Siebert² in
2000, estimated the
annual loss caused
by Botryosphaeria
and Eutypa in the
California wine
grape industry was
$260 million. Similar
negative effects have
been reported in
other grape growing
areas and trunk
diseases.
Management
Trunk diseases are considered chronic
diseases, and unfortunately there is
no fungicide that can provide curative
action. Preventive management or the
Additional Environmental Stress Conditions that the product is useful for:
What is
Anti-Stress 550®?
When to apply
Anti-Stress 550®?
Frost & Freeze
Continued on Page 14
Beat the Heat & Care
for Your Crops with:
Anti-Stress
550 ®
• High Temperatures & Extreme Heat
• Drought Conditions
• Transplanting • Drying Winds
A foliar spray that creates a
semi-permeable membrane
over the plant surface.
Optimal application period is
one to two weeks prior to the
threat of high heat.
% Infection
60
40
20
0
0
5 10 15 20
Year
Figure 1. Trunk disease infection development in unattended
vineyard.
When is Anti-Stress 550®
most effective?
The coating of Anti-Stress
becomes effective when the
product has dried on the plant.
The drying time of Anti-Stress is
the same as water in the same
weather conditions.
*One application of Anti-Stress 550® will remain effective 30
to 45 days, dependent on the rate of plant growth,
application rate of product and weather conditions.
559.495.0234 • 800.678.7377
polymerag.com • customerservice@polymerag.com
Order from your PCA or local Ag Retailer / Crop Protection Supplier
September /October 2019
www.progressivecrop.com
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