Mar_Apr_PCC_2017_Web

esistance, and work is being done
out of Washington State and UC
Davis. They are looking specifically
at resistance to powdery mildew,
Jordan said.
Sprayer calibration is also important
when making a spray application.
“This is so vastly important
and under talked about,” Jordan
stressed.
• Is the spray being applied where
it’s needed?
• Are the nozzles angled correctly?
• Is the fruit being hit by the spray?
• Has shoot and leaf thinning been
done for better spray penetration?
Preventative v Curative
The best control for powdery
mildew is a preventative program,
Jordan said.
“Powdery mildew can be a problem
on any variety if you don’t have
the proper preventive management,”
Jordan said.
“Frankly, there’s not a lot of really
good options for curative treatment,”
Jordan said.
“The biggest thing I think we
have to remember with a lot of our
fungicides programs is, they’re really
preventative. We don’t have curative—no
real true arsenal of curative
options,” Jordan said.
“There’s a few things you can do,
but those are things you don’t want
to have to be doing. You want to
be using your fungicide program
effectively as a preventative measure
before infection gets there,” Jordan
said.
Make sure and stay on top of the
spray intervals, and remember that
vines don’t work off the calendar.
They work off seasonal climate conditions,
Jordan said.
This could mean making spray
applications earlier than is historically
the norm, or later if it stays
cooler, Jordan said.
Monitoring for powdery mildew
in the field is also advised. I think
it’s important to scout and look for
visual signs of infection, Jordan
said.
Going into a potentially high
pressure year means it’s important
to use preventative products effectively,
and not scramble when there’s
rain in the forecast to get out in the
field and spray, Jordan said.
“That should have already been
a decision you’ve made because you
know your interval was that date,”
Jordan said.
“Realistically, knowing it’s been
rainy, it shouldn’t come as a surprise
to you in your management, and it
should be taken into account,” Jordan
said, whether it’s using a product
that has a longer interval period,
or using a synthetic fungicide earlier
in the season that hasn’t been used
2015
Yield
Jumbo
Large
Light color
Edible Yield
2016
Yield
Jumbo
Large
Light color
Edible Yield
before.
Oftentimes this can mean spending
more money, but maybe that’s
what fits the program as opposed to
having to rely on every seven days
or so for sulfur, Jordan said.
It all comes down to managing to
the conditions that are there, Jordan
said.
· · · · PCC
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in Walnut
Increase Set and Size
Spray 3-4 pts/ac foliar applications at catkin elongation and pistillate bloom..
Yield and Size in Chandler. 2012 - Chile
Control AfriKelp ®
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Kernel size (g) 6.39 8.23
Yield and Sizes on Chandler for 2
Seasons. 2015 and 2016. CA, USA
Control
4098
83%
5%
81%
42.98%
Control
3906
58%
20%
90%
43.72%
AfriKelp ®
4640
84%
4%
90%
45.8%
AfriKelp ®
5122
69%
15%
91%
43.18%
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March/April 2017 www.progressivecrop.com Page 17