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VINEYARD REVIEW<br />
Continued from Page 34<br />
3. Recheck your calibration variables<br />
by looking at spray coverage. Use water<br />
sensitive spray cards or add a visible marker<br />
like kaolin clay to the tank, to check the<br />
spray coverage once you’ve calibrated.<br />
Water sensitive spray cards used to be hard<br />
to find, but a quick check online gave me<br />
three results—Gemplers, Sprayer Depot<br />
and Amazon—for places to purchase.<br />
No fancy tools needed! A simple bucket can be used to measure the sprayer output after<br />
spraying out for a measured amount of time, as demonstrated here by U.C. Cooperative<br />
Extension Farm Advisor Franz Niederholzer.<br />
Put the spray cards in the canopy where<br />
you are targeting your spray. You can use<br />
mailing tags, with a card stapled to each<br />
side, to easily hang them in the canopy.<br />
Hang several also in areas where you<br />
don’t want to see spray. Remember to flag<br />
the branches where the paper is hung<br />
for easy retrieval. Then, run your sprayer<br />
down the row and retrieve the cards after.<br />
Interpreting what you see on the paper<br />
can be a bit tricky—you want to look for<br />
about 85 dots per square centimeter (see<br />
https://sprayers101.com/confirm-coverage-with-water-sensitive-paper/<br />
for a visual<br />
A FRESH APPROACH TO SPRAYING VINEYARDS<br />
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36 Progressive Crop Consultant <strong>Nov</strong>ember / <strong>Dec</strong>ember <strong>2019</strong>
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