Full TGIF Record # 309451
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Web URL(s):https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Paper/120074
    Last checked: 11/26/2019
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Hutchens, Wendell J.; Nagaoka, Yumiko; Kerns, James P.; Goatley, James M.; Nita, Mizuho; McCall, David S.
Author Affiliation:Hutchens, Goatley, and McCall: School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA; Nagaoka and Kerns: Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC; Nita: School of Plant and Environmental Sciences, Virginia Tech, Winchester, VA
Title:Variable sensitivity of Ophiosphaerella spp. causing spring dead spot to fungicides and temperature
Section:C05 turfgrass science
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Turfgrass pest management oral 1 (includes student competition)
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Meeting Info.:San Antonio, Texas: November 10-13, 2019
Source:ASA, CSSA and SSSA International Annual Meetings. 2019, p. 120074.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Keywords:TIC Keywords: Chemical sensitivity; Disease control; Fungicide application; Fungicide efficacy; Fungicide evaluation; Ophiosphaerella herpotricha; Ophiosphaerella korrae; Spring dead spot; Temperature response
Abstract/Contents:"Spring dead spot caused predominantly by Ophiosphaerella herpotricha and O. korrae in North America is the most devastating disease to bermudagrass [Cynodon spp.] in areas where winter dormancy occurs. Fungicidal suppression of the disease has been inconsistent with several active ingredients. It is unknown whether species susceptibility may be a cause of the inconsistency. Additionally, optimal growth temperatures influence fungicide application timing thereby affecting fungicide efficacy. Previous research suggests O. herpotricha and O. korrae have different optimal growth temperatures in vitro. Two in vitro laboratory experiments were conducted with four isolates of each O. herpotricha and O. korrae. The objective of the first experiment was to determine the EC50 values of the four representative Ophiosphaerella isolates of each species to 13 different fungicides (DMIs: fenarimol, mefentrifluconazole, myclobutanil, propiconazole, tebuconazole; QoIs: azoxystrobin, fluoxastrobin, pyraclostrobin; SDHIs: fluopyram, fluxapyroxad, isofetamid, penthiopyrad, and pydiflumetofen). Potato dextrose agar (PDA) was amended with each fungicide at either 0, 0.001, 0.01, 0.1, 1, or 10 mg L-1. Pydiflumetofen was the most efficacious of all fungicides tested, regardless of species, with an average EC50 value of 0.023 mg L-1. O. herpotricha was significantly (P < 0.1) more sensitive to myclobutanil, propiconazole, azoxystrobin, pyraclostrobin, fluxapyroxad, and penthiopyrad than O. korrae while O. korrae was more sensitive to fenarimol. All other fungicides suppressed each species equally. The objective of the second experiment was to determine the optimal temperature for growth in vitro of the four O. herpotricha and four O. korrae isolates on PDA. The optimal temperature for growth of both species was 24┬░C. These data suggest that inconsistent fungicide efficacy is partly due to variability in sensitivity of species to certain fungicides. Moreover, our data show that optimal growth for both species occurs above the recommended application temperature of 21┬░C, which may further impact fungicide efficacy."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hutchens, W. J., Y. Nagaoka, J. P. Kerns, J. M. Goatley, M. Nita, and D. S. McCall. 2019. Variable sensitivity of Ophiosphaerella spp. causing spring dead spot to fungicides and temperature. Agron. Abr. p. 120074.
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