Full TGIF Record # 324912
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Web URL(s):https://scisoc.confex.com/scisoc/2022am/meetingapp.cgi/Paper/143815
    Last checked: 01/24/2023
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Braithwaite, Emily T.; Schmid, Charles J.; McDonald, Brian W.; Kowalewski, Alexander R.
Author Affiliation:Braithwaite: Presenting Author and Oregon State University; Schmid and McDonald: Oregon State University; Kowalewski: Oregon State University - Horticulture
Title:A novel method for evaluating fungicide mode of action on curative control of Microdochium nivale
Section:Turfgrass Pest Management Poster: Diseases, Insects, Weeds II
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C05 turfgrass science
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Meeting Info.:Baltimore, Maryland: November 6-9, 2022
Source:ASA, CSSA, SSSA International Annual Meeting. 2022, p. 143815.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Microdochium patch, caused by the fungal pathogen Microdochium nivale, is a disease of annual bluegrass (Poa annua) in the Pacific Northwest. Management of this disease with fungicides can occur from September through May, but oftentimes superintendents deal with disease breakthrough that requires curative control. The objective of this research was to evaluate the efficacy of different fungicide modes of action applied on a curative basis to disease infection centers. A novel method for assessing this in the field was developed. The experiment took place in spring 2022 at the Lewis-Brown Horticulture Farm in Corvallis, OR. Experimental design was a randomized complete block design with six replications. Individual infection centers of Microdochium patch ranging in size from 3.8-5.1 cm were cupped out of an annual bluegrass putting green that had not been managed for disease using a Par-Aide HIO 10.8 cm cup cutter. Fungicide application treatments were applied to the plugs with a CO2-powered backpack sprayer at 280kPa with a carrier volume of 814 L ha-1, and then plugs were transferred to a putting green that had been under routine fungicide maintenance. Treatments included contact fungicides (chlorothalonil, fluazinam, PCNB), a local penetrant (iprodione), an acropetal penetrant (propiconazole), a systemic penetrant (polyoxin-d), and a non-treated control. Following treatment application, and for the duration of the study, individual plugs were covered overnight, for at least 12 hours, with a Tupperware container to provide optimal disease conditions. Response variables included percent change in infection center diameter (mm) every seven days, as well as daily presence/absence of aerial mycelium (Y/N) to indicate whether disease was active or not. Recovery of infection centers applied with propiconazole was significantly slower than the other penetrants (iprodione and polyoxin-d). Both chlorothalonil and fluazinam reduced the incidence of aerial mycelium, but infection center diameter increased throughout the trial dates."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Braithwaite, E. T., C. J. Schmid, B. W. McDonald, and A. R. Kowalewski. 2022. A novel method for evaluating fungicide mode of action on curative control of Microdochium nivale. Agron. Abr. p. 143815.
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    Last checked: 01/24/2023
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