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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1995/Environmental/29266,%20Purdue,%20Turco.PDF
Last checked: 11/07/2013
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Pitts, C.; Turco, R.; Throssell, C. |
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| Author Affiliation: | Laboratory for Soil Microbiology and Turfgrass Research Programs, Department of Agronomy, Purdue University, West Lafayette, Indiana |
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| Monograph Title: | Degradation of Fungicides in Turfgrass Systems: 1995 Annual Research Report, 1995. |
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| Publishing Information: | West Lafayette, Indiana: Purdue University |
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| # of Pages: | 9 |
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| Collation: | [9] pp. |
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| Abstract/Contents: | "Increasing public concern over the fate of organic pesticides has necessitated research describing the degradation and potential accumulation of these compounds. This USGA funded study strives to increase understanding of the fate of fungicides that reach the turf canopy, thatch and soil. This project is broken into three tasks with specific objectives of describing sorption coefficients for fungicides in the turfgrass canopy, determining the importance of microbial populations in controlling the degradation of fungicides on turfgrass leaves, and characterizing the long term fate of fungicides that reach the thatch and soil environment. The work done this first year of the three year project as primarily focused on the field portion of task one which investigates the hypothesis that the chemical/physical structure of the leaf controls initial sorption fungicides. Pesticide which is tightly sorbed to the turfgrass leaf may not be available for microbial degradation or movement into the thatch and soil. Concentrations of fungicides on Penncross creeping bentgrass clippings were measured experimentally over a period of four weeks allowing determination of half lives and dissipation patterns of parent compounds. Data was averaged from two identical experiments initiated on 12 May and 25 August 1995. Other areas of progress include developing laboratory procedures for all tasks and obtaining three of the four radiolabeled fungicides needed to meet our objectives. To extend the applicability of our work, four fungicides which represent four families of chemicals are being used in this project: chlorothalonil (Daconil 2782), metalaxyl (Subdue), triadimefon (Bayleton) and vinclozolin (Curalan). Loss of fungicide was clearly shown in turfgrass clippings from creeping bentgrass plots. Concentrations of metalaxyl, triadimefon, and vinclozolin fell below detectable limits within 13, 10, and 17 days respectively. In both experiments chlorothalonil was detectable at low levels from clippings collected at the termination of the experiment on day 27. The average peak fungicide concentrations extracted from turfgrass clippings were 38.16 μg g-1 (dry clipping weight) for metalaxyl, 112.46 μg g-1 for triadimefon, 549.65 μg g-1 for chlorothalonil and 370.35 μg g-1 for vinclozolin. The half lives of parent fungicides were 4.4 days, 1.1 days, 3.2 days, and 2.6 days for metalaxyl, triadimefon, chlorothalonil, and vinclozolin respectively. High initial concentrations of fungicides coupled with rapid loss from turfgrass clippings indicates that dissipation in the field is not limited by sorption. In conclusion, when fungicides are applied at recommended rates pesticide loading is unlikely on the live turfgrass plant." |
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| Language: | English |
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| References: | 9 |
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| See Also: | See also related summary article "Degradation of fungicides in turfgrass systems" [USGA], 1995, p. 78-79, R=29266. R=29266 |
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| Note: | "1995 Annual Report"
Also appears as pp. 00114-00123 in the USGA Turfgrass Research Committee Reporting Binders for 1995.
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Last checked: 11/07/2013
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