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Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t03.asp Last checked: 11/11/2016 Notes: Report Summary https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T003.pdf Last checked: 11/11/2016 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Publication Type:
| Report |
Author(s): | Wong, F. P.;
Rios, J. C. |
Author Affiliation: | Department of Plant Pathology and Microbiology, University of California, Riverside, California |
Title: | Evaluation of fungicides for curative control of dollar spot in southern California, 2008 (I) |
Section: | Turfgrass Other records with the "Turfgrass" Section
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Source: | PDMR: Plant Disease Management Reports. Vol. 3, 2009, p. T003. |
Publishing Information: | St. Paul, MN: American Phytopathological Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Agrostis stolonifera; Dollar spot; Fungicide efficacy; Fungicide evaluation; Poa annua; Sclerotinia homoeocarpa; Therapeutic control
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Cultivar Names: | Penn A-4 |
Geographic Terms: | Southern California |
Abstract/Contents: | "The objective of this study was to evaluate the efficacy of fungicides for the control of dollar spot on a mixed creeping bentgrass and annual bluegrass experimental green at UC Riverside. The green was a 90/10 mix of creeping bentgrass and annual bluegrass, established in 2005 from sod. Turf was mowed 3 days a week at a height of 0.25-in. and irrigated daily according to ET needs. Treatment plots were 4 ft ^D#m 6 ft, and each plot was inoculated on 8 Sep with approximately 0.2 to 0.4 oz of oat seed infested with S. homoeocarpa spread out evenly onto each plot. Inoculum was produced by growing S. homoeocarpa on autoclaved oat seed for 4 weeks at 28°C prior to use using a mix of five isolates obtained from five different California locations. Disease symptoms developed on the plots after 11 Sep. Curative fungicide treatments were applied starting 18 Sep to four replicated plots per treatment with a CO2-powered backpack sprayer, using TeeJet 8002 flat fan nozzles to deliver the equivalent of 2 gal dilute fungicide spray per 1,000 sq ft at 35 psi at an approximate 14- or 21-day interval, with the last application being made on 30 Oct. Disease severity was rated by evaluation of percent area diseased on a 0 to 100 scale. Disease severity data was analyzed by ANOVA and mean comparisons were performed for rating dates where P ≤ 0.05 using Fisher's Protected Least Significant Difference test (α = 0.05). The initial disease symptoms were very uniform throughout the plots prior to fungicide application. Maximum air temperatures were in the mid 80 to mid 90°F between Sep to mid-Oct, but temperatures in the 60 to 70°F range afterwards appeared to decrease disease development. Overall, all treatments provided significant control compared to the water only check; differences between treatments were most apparent prior to the late Oct period of decreasing disease pressure. Tartan and Bayleton treatments appeared to give the best control throughout the trial. The DMI fungicide (Chipco) Triton FLO appeared to give better control when used at the 0.6 fl oz rate, compared to the 0.4 oz rate. The combination products Concert (chlorothalonil + propiconazole) and Headway (azoxystrobin + propiconazole) performed very well; better than Renown (azoxystrobin + chlorothalonil) in most cases. Renown used at 2.5 or 4.5 fl oz and 14-day application intervals performed better than the same rates used at 21-day intervals, the tank mix of Heritage and Daconil or Daconil used alone." |
Language: | English |
References: | 0 |
See Also: | See also Part 2 "Evaluation of fungicides for curative control of dollar spot in southern California, 2008 (II)" Plant Disease Management Reports, Vol. 3 2009, p. T002 R=154514 R=154514 |
Note: | This item is only an abstract and tables! Tables |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Wong, F. P., and J. C. Rios. 2009. Evaluation of fungicides for curative control of dollar spot in southern California, 2008 (I). PDMR: Plant Dis. Manage. Rep. 3:p. T003. |
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