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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T009.pdf
Last checked: 11/11/2016
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Access conditions: Item is within a limited-access website
https://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t09.asp
Last checked: 11/11/2016
Notes: Report Summary |
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| Publication Type:
| Report |
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| Author(s): | Wong, F. P.;
Chen, C. M.;
Stowell, L. J.;
Carpenter, W. B. |
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| Author Affiliation: | Wong and Chen: Department of Plant Pathology and Microbiology, University of California, Riverside; Stowell: PACE Turfgrass Institute, San Diego; Carpenter: Torrey Pines Golf Course, La Jolla, California |
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| Title: | Evaluation of DMI and biological fungicides for the control of brown ring patch in southern California, 2008 |
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| Section: | Turfgrass
Other records with the "Turfgrass" Section
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| Source: | PDMR: Plant Disease Management Reports. Vol. 3, 2009, p. T009[1]-T009[2]. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Biological fungicides; Brown ring patch; DMI fungicides; Disease control; Fungicide efficacy; Fungicide evaluation; Poa annua; Waitea circinata var. circinata
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| Geographic Terms: | Southern California |
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| Abstract/Contents: | "The objective of this experiment was to evaluate DMI-fungicides, DMI tank mixes and biological fungicides for the control of brown ring patch. The experiment was conducted on a putting green located at Torrey Pines Golf Course in La Jolla, CA. The green was an approximate 80/20 mix of annual bluegrass and creeping bentgrass established on native soil. Turf was mowed three times a week at a cutting height of 0.150-in. Irrigation was applied daily according to evapotranspiration needs. Disease development was observed on annual bluegrass in the first week of April and on 11 Apr, experimental plots (6 ft x 6 ft) were arranged in a randomized block design on the green, using four replicated plots per treatment. Each fungicide was applied once as a curative treatment on 18 Apr. All fungicide treatments were applied with a CO2-powered boom sprayer fitted with four TeeJet 8002 nozzles at 35 psi, using the equivalent of 2 gallons of dilute fungicide solution per 1,000 sq ft, and the green was irrigated for 3 min after the application of all fungicides (approximately one turn of each irrigation head). Disease severity was evaluated on a 0 to 10 scale, with 0 = no disease, 5 = 50% of the plot affected by disease and 10 = 100% of the plot affected by disease, starting on 11 Apr and every 7 days afterwards. AUDPC values, based upon the sum of disease ratings from 18 Apr to 23 May, were also used for treatment comparisons. Severity and AUDPC data were analyzed by ANOVA and mean comparisons were performed using Fisher's Protected LSD (α = 0.05). No significant difference in disease in plots was observed on 11 and 18 Apr (ANOVA P = 0.93 and 0.88, respectively) and disease increased from a mean 1.8 to 6.0 rating from 11 Apr to 2 May. From 2 May to 23 May, disease decreased to a mean 3.8 rating due to the coalescing of expanding rings, suggesting potential antagonism between different genotypes of the pathogen (potential anastomosis and killing reactions between individuals). Creeping bentgrass was unaffected by the disease. The Bacillus spp. based biological products Rhapsody and Humabalance, did not provide control of the disease at any of the evaluation dates. Control was equivalent to or worse than the check. These two products will not be considered for the rest of this discussion. On 25 Apr, seven days after application, all DMI-treatments provided significant control of the disease. Instrata, (Chipco) Triton FLO plus either (Chipco) 26GT or ProStar, Medallion plus Banner MAXX, Headway and Endorse plus Headway provided the best control, with Headway and Endorse plus Banner MAXX treated plots having the lowest amount of disease. By 2 May, Triton FLO plus 26GT or ProStar, Trinity plus Insignia, Banner MAXX plus Medallion or Endorse, Headway, and Tourney provided complete control of the disease. Triton FLO and Trinity, used alone, provided less control although values were statistically equal to the best treatments. Banner MAXX and Instrata provided less control than other treatments on 2 May, but values were still significantly lower than the check. By 9 May, many of the treatments provided excellent disease control. By this time, Triton FLO and Trinity used alone appeared to provide complete or near complete control. However, a slight increase in disease was noted in plots treated with Banner MAXX, Banner MAXX plus Medallion, or Headway. By 16 May, disease appeared to be increasing in plots treated with Banner MAXX, Banner MAXX plus Medallion, Instrata and Headway, although control was still significant. By 23 May, these treatments were equivalent to the check treatment, while the remaining treatments still appeared to provide lasting disease control. It appears that there are significant differences between the DMIs and DMI-tank mixes for control of brown ring patch. Amongst the DMIs tested, Trinity, Triton FLO and Tourney provided the best control. However, Banner MAXX plus Endorse or Headway (equivalent to a tank mix of Banner MAXX plus Heritage) provided the best numerical and visible control of the disease 7 days after application. Instrata (a pre-mix equivalent to Banner MAXX, Medallion and Daconil) and Banner MAXX plus Medallion, also appeared to give good curative control after 7 days. With the exception of Banner MAXX plus Endorse, all Banner MAXX treatments (alone, tank-mix and pre-mix) appeared to lose control 14 to 21 days after curative application. Trinity, Triton FLO, and Tourney all appeared to be equivalent for disease control. The tank mixes of Triton FLO plus 26 GT or ProStar appeared to give numerically slightly better control 7 days after application, and at 28 and 35 days after application compared to Triton FLO used at the 1.1 fl oz rate (although all values were statistically equivalent). Trinity (1 oz) plus Insignia (0.5 oz) gave control equivalent to Trinity used alone at 2 oz." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is only an abstract and tables!
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Wong, F. P., C. M. Chen, L. J. Stowell, and W. B. Carpenter. 2009. Evaluation of DMI and biological fungicides for the control of brown ring patch in southern California, 2008. PDMR: Plant Dis. Manage. Rep. 3:p. T009[1]-T009[2]. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T009.pdf
Last checked: 11/11/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website
https://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t09.asp
Last checked: 11/11/2016
Notes: Report Summary |
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