Are there other retractable shielded sprayer technologies (non-ULV) that
allow for in-row spray while lowering the risk of contacting tree trunks
with herbicide?
On Thu, Oct 30, 2014 at 1:37 PM, David A. Rosenberger da...@cornell.edu
wrote:
We experimented with a ULV shielded applicator (Bubco) for herbicide
applications in our research orchards many years ago. In our hillside
orchards, the shield was never low enough on the down-hill side, and we
killed a number of trees by hitting trunks with concentrated glyphosate.
Unless you have a lot of money to waste, you should absolutely NEVER NEVER
apply glyphosate in apples or stone fruits with a CDA applicator. No
matter how well shielded they are, you will end up damaging trees. They
may work OK on grapes and some other crops, especially on flat land, but I
would never suggest that the risk is worth the benefit for apples and stone
fruits. DCA applicators may work OK for applying gramoxone (and some other
herbicides??) because any gramoxone drift that escapes will only cause
yellow spots on leaves (white spots on fruit) without becoming systemic
within the trees.
Work by Hanna Mathers at Ohio State has shown that sub-lethal glyphosate
exposure (via leaves or through the bark on young trees) will reduce winter
hardiness. I have seen several orchards over the course of my career that
were destroyed by drift of glyphosate into lower limbs followed by a cold
winter. You can do this without buying a CDA applicator if your
higher-volume herbicide sprayer is not shielded and generates a lot of
small drift-prone droplets. Nevertheless, applying a high concentration
solution of glyphosate to apples with a sprayer specifically designed to
generate very small droplets is the business equivalent of playing Russian
roulette.
Dave Rosenberger, Professor Emeritus
Dept. of Plant Pathology and Plant-Microbe Biology
Cornell’s Hudson Valley Lab, P.O. Box 727, Highland, NY 12528
Office: 845-691-7231Cell: 845-594-3060
http://blogs.cornell.edu/plantpathhvl/blog-2014/
On Oct 30, 2014, at 9:21 AM, Matt Pellerin m...@treworgyorchards.com
wrote:
I have been researching different options for herbicide application in
my orchard and came across Mankar ULV herbicide applicators.
http://www.mankarulv.com/ The company promotes its shielded CDA
applicators as virtually drift-free. However, I have read in some apple
publications that the small droplets made by CDA applicators are inherently
prone to drift. Does anyone have any clarifying information or experience
with this equipment?
Thanks,
--
Matthew Pellerin
Agricultural Manager
Treworgy Family Orchards
3876 Union St
Levant, ME 04456
www.treworgyorchards.com
207-884-8354
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--
Matthew Pellerin
Agricultural Manager
Treworgy Family Orchards
3876 Union St
Levant, ME 04456
www.treworgyorchards.com
207-884-8354
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