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: 845-691-7231 Cell: 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 > _______________________________________________ > apple-crop mailing list > apple-crop@virtualorchard.net > http://virtualorchard.net/mailman/listinfo/apple-crop > > > > _______________________________________________ > apple-crop mailing list > apple-crop@virtualorchard.net > http://virtualorchard.net/mailman/listinfo/apple-crop > > -- Matthew Pellerin Agricultural Manager Treworgy Family Orchards 3876 Union St Levant, ME 04456 www.treworgyorchards.com 207-884-8354
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