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| Web URL(s): | https://wssa.net/wp-content/uploads/2022-WSSA-CWSS-Proceedings-Final-April-4.pdf#page=131
Last checked: 06/20/2023
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): | Peppers, John M.;
Elmore, Matthew T.;
Askew, Shawn |
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| Author Affiliation: | Peppers and Askew: Virginia Tech, Blacksburg, VA; Elmore: Rutgers University, New Brunswick, NJ |
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| Title: | Evaluation of goosegrass and creeping bentgrass response to combinations of topramezone and chlorothalonil |
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| Meeting Info.: | Virtual: February 22-24, 2022 |
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| Source: | Abstracts of the Annual Meeting of the Weed Science Society of America. 2022, p. 131. |
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| Publishing Information: | [United States]: Weed Science Society of America |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Topramezone is regularly applied to cool-season turfgrass to control warm-season grassy weeds such as goosegrass (Eleusine indica). Due to the partial tolerance of creeping bentgrass (Agrostis stolonifera), topramezone is commonly applied as part of a low dose, frequent application program. Throughout the summer months, topramezone is typically applied concurrently with many other agrochemicals. Turfgrass managers often mix multiple crop protection products to reduce application costs and traffic to turfgrass. These mixtures can sometimes be antagonistic to one or more products in the mixture. This phenomenon has been well studied with respect to mixtures of multiple herbicides but few studies have evaluated how fungicide + herbicide mixtures may affect weed control efficacy. The objective of this research was to evaluate goosegrass control with two topramezone rates applied alone and in combination with a standard rate of two chlorothalonil formulations. A field study was conducted in the summer of 2021 at the Virginia Tech Campus Golf Course to evaluate goosegrass control with topramezone alone and in combination with two formulations of chlorothalonil. Topramezone was applied alone at 3.68 and 6.13 g ai/ha. Both rates of topramezone were also applied with 7356 g ai/ha of Daconil Weatherstik and Daconil Action. All treatments contained methylated seed oil adjuvant at 0.5% v/v and were applied on July 21 with a reapplication on August 6. Goosegrass was between 3-5 tillers (Figure 1) at study initiation. Two greenhouse studies were also conducted to evaluating goosegrass response to a broader range of topramezone rates (0, 1, 2, 4 and 6 g ai/ha) either alone or in combination with chlorothalonil (Daconil Weatherstik) applied at 7356 g ai/ha. A second application was made 3 weeks after the initial treatment (WAIT). In the field study, topramezone controlled goosegrass 70-81% at 6 WAIT and control was reduced at least 28% when either chlorothalonil formulation was added to the mixture. Chlorothalonil formulations did not significantly differ in their impact on goosegrass control at any assessment. In controlled environment studies, chlorothalonil admixture required 28% more topramezone to control goosegrass 50% compared to topramezone alone with a concomitant 67% increase in topramezone rate to achieve 50% biomass reduction. These studies suggest that chlorothalonil should not be mixed with topramezone when used for goosegrass control." |
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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):
Peppers, J. M., M. T. Elmore, and S. Askew. 2022. Evaluation of goosegrass and creeping bentgrass response to combinations of topramezone and chlorothalonil. Abstr. Annu. Meet. Weed Sci. Soc. Am. p. 131. |
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| Web URL(s):
https://wssa.net/wp-content/uploads/2022-WSSA-CWSS-Proceedings-Final-April-4.pdf#page=131
Last checked: 06/20/2023
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2180085 |
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