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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2007.pdf#page=109
Last checked: 07/01/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Askew, S. D. |
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| Author Affiliation: | Virginia Tech, Blacksburg |
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| Title: | Applicator exposure and drift of lawn chemicals with a wet blade mower and three foliar spray methods |
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| Section: | Turfgrass and plant growth regulators
Other records with the "Turfgrass and plant growth regulators" Section
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| Meeting Info.: | Baltimore, Maryland: January 2-5, 2007 |
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| Source: | Proceedings of the Sixty-First Annual Meeting of the Northeastern Weed Science Society. Vol. 61, 2007, p. 91. |
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| Publishing Information: | Baltimore, Maryland: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Application methods; Applicator safety; Spray drift; Spraying methods; Wet blade mowers
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| Abstract/Contents: | "In the home lawn environment, applicators, residents, and surrounding vegetation are all at risk of pesticide exposure. Herbicides such as 2,4-D have been shown to dislodge from treated lawns and be deposited inside the home on various surfaces. Thus, limiting applicator exposure, reentry exposure, and drift are all valuable attributes to any application method. The wet blade mower delivers chemicals and nutrients to plants by wiping liquid product onto the cut plant surface. This liquid delivery method has several potential benefits compared to conventional spray techniques. Our objective was to evaluate applicator exposure, reentry exposure, and drift of liquids applied with the wet blade mower (WB), a rear-mounted boom-type sprayer (BS), a backpack sprayer with hand wand (BP), and a commercial "spray gun" type sprayer (SG). A spray pattern indicator, Brazon (1% solution), was used in this study. Mixed tall fescue and Kentucky bluegrass turf maintained at 2.5 inch were divided into 500 ft2 plots. These plots were treated with 2.5 gal of Brazon/A at a delivery rate of 43.6 gal/A for foliar spray methods and 2.5 gal/A for the WB. Filter papers were placed at regular intervals leading away from the sprayers first pass in each plot. A wind source was positioned to supply a sustained wind speed of 5 to 7 mph. The first pass of the applicator was upwind of the evenly spaced filter papers; papers were immediately collected after the applicator passed. Filter papers were affixed to the applicators spray suit to test exposure at different areas on the body. These papers were collected after each treated plot and analyzed. In addition, papers were affixed to the bottom, front, and top of the right shoe and plots were traversed twice at 10 min and 24 hr after treatment. Each of the four application methods were replicated three times in a RCB and the study was conducted on October 27, 2005, October 3 and 4, 2006 at three different sites. Substantial drift occurred from all foliar spray application methods but not from the WB. When actual dye values were converted, the foliar spray application methods deposited 77 to 86% of a full rate on bare ground while the WB deposited 22% of a full rate to bare ground. Thus, the WB does not apply as much chemical to areas that are void of vegetation. The small amount of chemical deposited by the mower is attributed to "shatter" effect as the wet undersurface of the mower blade contacts grass leaf blades at high velocity and propels small droplets onto neighboring areas under the mower deck. As much as 58 to 81% of a full application rate was extracted from the shoe front 10 min after treatment with foliar spray methods and 35% was extracted 10 min after WB application. After 24 hr, all application methods resulted in 2 to 7% of the full rate dislodged by filter paper and were statistically equivalent. WB and rear boom application methods did not expose the applicator to any chemical while SG and pump sprayer methods exposed the worker to between 6.1 and 8.9 μl of dye. In some locations on the body (e.g., shoes), the applicator was exposed to nearly a full chemical rate. The WB method reduced drift, applicator and early reentry exposure to chemical dye in all studies." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D. 2007. Applicator exposure and drift of lawn chemicals with a wet blade mower and three foliar spray methods. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 61:p. 91. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2007.pdf#page=109
Last checked: 07/01/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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