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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Clarke, Bruce B.;
Majumdar, Pradip;
Murphy, James A.;
Dernoeden, Peter H. |
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| Author Affiliation: | Clarke and Majumdar: Department of Plant Pathology, Rutgers University; Murphy: Department of Plant Science, Rutgers University; and Dernoeden: Department of Agronomy, University of Maryland |
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| Title: | Strategies for improved chemical control of summer patch |
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| Section: | Plenary presentations
Other records with the "Plenary presentations" Section
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| Meeting Info.: | January 16-17, 1997: Cook College |
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| Source: | Proceedings of the Sixth Annual Rutgers TurfgrassSymposium. 1997, p. 28. |
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| Publishing Information: | New Brunswick, NJ: Center for Turfgrass Science, Cook College, Rutgers, The State University of New Jersey |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Disease control; Fungicide evaluation; Chemical control; Summer patch; Magnaporthe poae; Poa pratensis; Poa annua; Fine fescues; Watering-in; Carrier volume; Fungicides
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| Abstract/Contents: | "Summer patch, caused by the ectotrophic root-infecting fungus Magnaporthe poae, is a damaging disease of Poa pratensis (kentucky bluegrass), P. annua (annual bluegrass), and Festuca spp. (fine fescues) in North America. Although benzimidazole and sterol-inhibiting fungicides can effectively suppress the disease, little is known about the application parameters that affect fungicide efficacy in the field. The objective of these field investigations were to assess the impact of water carrier volume (WCV) and post-treatment irrigation (PTI) on the efficacy of selected fungicides used to control summer patch. The study was conducted at two locations in New Jersey and one location in Maryland from 1988 to 1996. F. rubra subsp. rubra (strong creeping red fescue), P. annua, and P. pratensis were utilized at one, three, and three sites, respectively. Up to seven fungicide, three WCV (0.8 or 1.0, 2.0, and 4.1 kl ha⁻¹), and four PTI (0, 64 or 73, 128, and 256 kl ha⁻¹) treatments were arranged at each site in a randomized complete block design. The effect of WCV and PTI on fungicide efficacy was fungicide and host dependent. On F. rubra, PTI (73 kl ha⁻¹) reduced the the efficacy of propiconazole (Banner), cyproconazole (Sentinel), and fenarimol (Rubigan) compared to non-irrigated turf. In the absence of PTI, efficacy was improved when cyproconazole was applied in the highest WCV. When P. pratensis was evaluated in New Jersey, there was a significant fungicide X WCV X PTI interaction. All fungicides were more efficacious when applied in a WCV of 2.0 or 4.1 kl ha⁻¹ compared to 1.0 kl ha⁻¹. PTI did not enhance disease control except when propiconazole and triadimefon (Bayleton) (Maryland only) were applied at a WCV of 1.0 kl ha⁻¹ and irrigated with 64 kl water ha⁻¹. At the highest irrigation rate, however, PTI significantly reduced the efficacy of fenarimol, cyproconazole, and benomyl (Tersan 1991). On P. annua turf, fenarimol, triadimefon, or propiconazole enhanced disease control at a WCV of 0.8 kl ha⁻¹ plus a PTI of 64 kl ha⁻¹, compared to the same WCV treatment without irrigation. |
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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):
Clarke, B. B., P. Majumdar, J. A. Murphy, and P. H. Dernoeden. 1997. Strategies for improved chemical control of summer patch. Proc. Annu. Rutgers Turfgrass Symp. p. 28. |
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MSU catalog number: SB 433 .R88 |
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