Full TGIF Record # 237812
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DOI:10.1094/PHYTO-104-3-S1.1
Web URL(s):http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO-104-3-S1.1#page=5
    Last checked: 03/21/2014
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Publication Type:
i
Report
Author(s):Popko, J. T.; Jung, G.
Author Affiliation:University of Massachusetts-Amherst, Amherest, MA, U.S.A.
Title:Fungicide rotation strategies to manage Sclerotinia homoeocarpa populations resistant to DMI and benzimidazole fungicide classes
Section:2013 Northeast Division meeting abstracts
Other records with the "2013 Northeast Division meeting abstracts" Section
Source:Phytopathology. Vol. 104, No. 3, Supplement 1 2014, p. 5.
Publishing Information:Lancaster, Pennsylvania: The Society Intelligencer Printing Company for The American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Application timing; DMI fungicides; Disease control; Dollar spot; Fungicide evaluation; Fungicide resistance; Sclerotinia homoeocarpa
Abstract/Contents:"Dollar spot (Sclerotinia homoeocarpa F. T. Bennett) is the most economically important turfgrass disease in the Northeast. Dollar spot is primarily controlled by fungicide applications on golf courses and resistance to the sterol demethylation inhibitor (DMI) and benzimidazole fungicide classes has become increasingly widespread in the Northeastern region. Currently, there is limited information on the effectiveness of different fungicide rotation options for controlling S. homoeocarpa populations with confirmed fungicide resistance. Furthermore, some golf courses are located in environmentally sensitive areas where usage of the multi-site, contact fungicide chlorothalonil is restricted. The objectives of this study were to determine if DMI fungicides could be used in rotation strategies and to determine the effect of DMIs with and without chlorothalonil for dollar spot control. A two-year field trial was conducted on two golf courses located in Amherst and Southwick, MA with prior confirmation of benzimidazole and DMI resistance to test different rotation strategies on dollar spot control. Five applications per rotation strategy were made each year and dollar spot infection centers or percent dollar spot was evaluated on a weekly basis. Results from both years indicate that rotation strategies utilizing DMI fungicides early in the season (May/June) generally provided similar control to non-DMI fungicides. Increased dollar spot was observed in rotation strategies that made DMI applications later in the season (July/August); however, season-long disease control was similar to strategies that used DMI's early in the season. Results also indicate that rotation strategies that did not utilize chlorothalonil can provide similar control to strategies in which chlorothalonil was used. Overall, our data indicate DMI fungicides can be used under lower disease pressure and rotation strategies without chlorothalonil can provide adequate dollar spot control. These results offer superintendents practical dollar spot control solutions, however, the implications on long-term fungicide resistance management are uncertain."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Popko, J. T., and G. Jung. 2014. Fungicide rotation strategies to manage Sclerotinia homoeocarpa populations resistant to DMI and benzimidazole fungicide classes. Phytopathology. 104(3):p. 5.
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DOI: 10.1094/PHYTO-104-3-S1.1
Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO-104-3-S1.1#page=5
    Last checked: 03/21/2014
    Requires: PDF Reader
    Notes: Item is within a single large file
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