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| Web URL(s): | https://listings.lib.msu.edu/iowat/1991.pdf#page=137
Last checked: 01/10/2017
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Valenti, H. H.;
Christians, N. E.;
Owen, M. D. |
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| Author Affiliation: | Graduate Research Assistant; Professor, Turfgrass Science, Research and Teaching, Horticulture Department; Graduate Research Assistant, Iowa State University |
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| Title: | Non-target movement of herbicides applied to turfgrass areas |
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| Source: | 1991 Iowa Turfgrass Research Report. July 1991, p. 132. |
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| Publishing Information: | Ames, Iowa: Iowa State University |
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| Keywords: | TIC Keywords: Herbicides; Pesticides; Herbicide safety; Herbicide translocation
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| Abstract/Contents: | "Pesticide spray drift has been and will continue to be an important concern. The lawn care industry has been under special scrutiny because their predominant customer base is homeowners. Most studies conducted to investigate the effect of meteorological conditions, formulations, and application parameters on spray deposition have dealt with agricultural sprayers. Very little research has been directed toward the evaluation of equipment and the application parameters used in other areas such as the lawn care industry. Therefore, research has been undertaken to determine the efficiency under varying wind conditions of three common lawn-care spray nozzles and to quanitfy the level of off-target prticle movement within each. The three sprayers used were a hydraulic sprayer with a ChemLawn gun (registered), a carbon-dioxide pressurized backpack sprayer with 8004 VS (registered) nozzles, and a hydraulic sprayer with RA-6 (registered) nozzles. The delivery rates for the three sprayers were 3.5, 0.27, and 0.54 gal/min, respectively. The operating pressure and ground speed were adjusted for each sprayer so the mean volume rates were 120, 20 and 40 gal/a, respectively. The triethylamine salt of triclopyr [(3, 5, 6-trichloro-2-pyridinyl)oxy] acetic acid was applied at a rate of 0.45 lb ai/a with the addition of 0.01% w/v Fluorescein, a fluorescent dye. The spray application was made along a line perpendicular to wind direction. Three sampling lines were set perpendicular and downwind from the spray-swath edge. Sample location spacing was 1, 3, 5, and 7 ft. Two mylar sheets mounted on poster board and two tomato plants were placed at each location. Plants were spaced in a fan-like arrangement so that there would be no interference at each distance. Two crystallizing dishes at five locations were used to sample within the spray swath. Between the crystallizing dish locations, 2 potted turfgrass samples were placed. Immediately following application, plant samples, mylar sheets, and crystallizing dishes were collected and individually stored until fluorescent analysis could be completed. One of the 2 tomato plants at each sampling site was returned to the greenhouse for visual observations of triclopyr injury. In 1990, the experiment was run twice during September and November and although not all the data has been statistically analyzed, several observations were made. First, tomato plants next to the spray swath unavoidable received direct-spray contact with the Chemlawn gun (registered) and RA-6 (registered) nozzles. These plants showed severe herbicide injury. Second, plants further downwind showed very little or no injury with both types of equipment. Third, tomato plants at all four distances showed herbicide injury with the flat-fan nozzles. On both application dates the wind speed was very low (1-3 mph), which indicates potential danger when using flat-fan nozzles." |
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| Language: | English |
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| References: | 0 |
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| Note: | Article appears as abstract |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Valenti, H. H., N. E. Christians, and M. D. Owen. 1991. Non-target movement of herbicides applied to turfgrass areas. Iowa Turfgrass Res. Rep. p. 132. |
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| Web URL(s):
https://listings.lib.msu.edu/iowat/1991.pdf#page=137
Last checked: 01/10/2017
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 I55 |
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