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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t04.asp
Last checked: 11/11/2016
Notes: Report Summary
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T004.pdf
Last checked: 11/11/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Report |
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| Author(s): | Wong, F. P.;
Rios, J. C. |
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| Author Affiliation: | Department of Plant Pathology and Microbiology, University of California, Riverside, California |
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| Title: | Evaluation of Insignia fungicide and surfactants for curative control of southern blight in southern California, 2007 |
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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. T004. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Disease control; Fungicide efficacy; Fungicide evaluation; Poa annua; Pyraclostrobin; Sclerotium rolfsii; Surfactants; Therapeutic control
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| Cultivar Names: | Penn A-4 |
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| Trade Names: | Insignia |
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| Abstract/Contents: | "The objective of this study was to evaluate the efficacy of fungicides for the control of southern blight on a mixed creeping bentgrass and annual bluegrass experimental green at UC Riverside. The green was a 90/10 mix of 'Dominant' 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 x 4 ft, and each plot was inoculated on 21 May by making five 6-in. long cuts 1-in. deep into each plot and placing approximately 0.1 oz of oat seed infested with S. rolfsii into each slit. Inoculum was produced by growing S. rolfsii on autoclaved oat seed for 4 weeks at 28°C prior to use. Disease symptoms developed on the plots approximately 15 Jun as small yellow rings several inches in diameter and fungicide applications were initiated on 29 Jun. Symptom expression coincided with a increase in maximum daily air temperatures from approximately 75 to 85 °F in May to 85 to 95°F in Jun, Jul and Aug. Insignia fungicide was applied at the 0.5 oz at a 14-day interval or 0.9 oz at a 28-day interval, with or without surfactant (ACA 1820, 2663 or 2665). Treatments were applied 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 1000 sq ft at 35 psi, with the last application being made on 10 Aug. Disease severity was rated by evaluation of percent area diseased using a 0 to 11 modified Horsfall-Barratt scale and converted back to percent severity data. Area underneath the disease progress curve (AUDPC) was calculated based upon the severity readings taken on 13 and 27 Jul and 10 and 24 Aug. Disease severity data and AUDPC was analyzed by ANOVA and mean comparisons were performed 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. After the initial application on 29 Jun, treated areas stopped developing disease or recovered, while the untreated check continued to increase in severity. All fungicide treatments appeared to be different from the untreated check. Statistical differences amongst treatments were detected for the 27 Jul rating and onwards. On the 27 Jul rating date, it appeared that the application of Insignia at 0.5 oz plus surfactant or 0.9 oz rate with or without surfactant provided better control than the fungicide used at 0.5 oz alone. However, this effect appeared to diminish after this date and third application of Insignia at the 0.5 oz rate. Overall, based upon AUDPC calculations, it did appear that use of Insignia at 0.5 oz alone was not different from most treatments, but it did appear that Insignia at 0.5 oz plus ACA 2665, and Insignia at 0.9 oz alone or with ACA 2665 provided a statistically significant increase in disease control over the course of the trial." |
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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., and J. C. Rios. 2009. Evaluation of Insignia fungicide and surfactants for curative control of southern blight in southern California, 2007. PDMR: Plant Dis. Manage. Rep. 3:p. T004. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t04.asp
Last checked: 11/11/2016
Notes: Report Summary
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T004.pdf
Last checked: 11/11/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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