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| Web URL(s): | https://turf.rutgers.edu/wp-content/uploads/2024/03/symposium-2024.pdf#page=11
Last checked: 04/08/2024
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): | Zhang, Pingyuan;
Groben, Glen;
Fardella, Patrick;
Clarke, Bruce;
Murphy, James |
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| Author Affiliation: | Zhang and Fardella: Department of Plant Biology, Rutgers University; Groben: United States Department of Agriculture, Agricultural Research Service, Foreign Disease/Weed Science Research Unit, Frederick, MD and Oak Ridge Institute for Science and Education, Agricultural Research Service Research Participation Program, Oak Ridge, TN; Clarke: Professor Emeritus and Clarke Turf Consulting and Department of Plant Biology, Rutgers University; Murphy: Director, Center for Turfgrass Science and Department of Plant Biology, Rutgers University |
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| Title: | Impact of host susceptibility and autumn fungicide applications on the suppression of dollar spot the following spring |
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| Section: | Plenary presentations
Other records with the "Plenary presentations" Section
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| Meeting Info.: | Institute for Food, Nutrition, and Health Building, Room 101: March 14, 2024 |
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| Source: | Proceedings of the Thirty-Third Annual RutgersTurfgrass Symposium. Vol. 33, 2024, p. 11. |
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| Publishing Information: | School of Environmental and Biological Sciences, Rutgers University |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Anecdotal observations suggest that autumn-applied fungicide can reduce dollar spot the subsequent growing season. However, the optimal timing of autumn-applied fungicides and possible interactions with cultivars varying in resistance to dollar spot are unclear. Two trials were seeded in 2021 and 2022 and managed as a fairway turf at a mowing height of 9.5-mm. Twelve autumn fungicide levels and three creeping bentgrass (Agrostis stolonifera L.) cultivars (Coho, 007, and Independence, in order of decreasing resistance to dollar spot) were evaluated for the suppression of dollar spot the subsequent season in a factorially arranged randomized complete block design with four replications. Seven calendar-based fungicide timing levels were applied using a tank mix of fluazinam and propiconazole (0.7 kg a.i. and 1.5 kg a.i. per ha, respectively) either once (three timings), twice (three timings), or thrice (one timing) in September, October and/or November. The eighth fungicide level was a calendar-based timing of chlorothalonil (15.3 kg a.i. per ha) applied thrice. The ninth and tenth fungicide levels were two weather dependent (Smith-Kerns model) timings of the fungicide tank mix applied when the risk index reached 20 or 40%. The eleventh fungicide level was a damage threshold-based application of the fungicide tank mix when dollar spot damage reached 105 mm2 m-2 and the twelfth level was a non-treated control. Disease onset was recorded for each plot and the number of days between the first observance of disease in the entire trial and the appearance of disease onset in each plot was calculated. Dollar spot severity during the onset period was measured as the area under disease progress curve (AUDPC) from the first date of disease onset on any plot through the date when disease was evident on all plots. Disease onset and AUPDC during the onset period were strongly influenced by the cultivar factor, which interacted with the fungicide and year factors. The latest disease onset occurred on Coho creeping bentgrass regardless of the autumn fungicide level or year. There was a limited delay in disease onset among autumn fungicide levels during 2022; however, some fungicide levels significantly delayed onset on 007 and Independence creeping bentgrass compared to the non-treated control during 2023. The lowest disease severity (AUDPC) during the onset period was observed on Coho and, therefore, there was little effect among autumn fungicide levels on this cultivar. Conversely, several autumn fungicide levels suppressed AUDPC on 007 and Independence creeping bentgrass; the sequential application of the tank mix in September and October was always among the autumn fungicide levels with the best suppression of disease in both years. Sequential applications of chlorothalonil in September, October and November had no or limited effect on AUDPC in both years indicating that fungicide chemistry is a factor needing further evaluation. These results indicate that the adoption of disease resistant cultivars is a management option with great potential for reducing fungicide inputs" |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zhang, P., G. Groben, P. Fardella, B. Clarke, and J. Murphy. 2024. Impact of host susceptibility and autumn fungicide applications on the suppression of dollar spot the following spring. Proc. Rutgers Turfgrass Symp. 33:p. 11. |
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| Web URL(s):
https://turf.rutgers.edu/wp-content/uploads/2024/03/symposium-2024.pdf#page=11
Last checked: 04/08/2024
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b3696858 |
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