Full TGIF Record # 317162
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Web URL(s):https://scisoc.confex.com/scisoc/2021am/meetingapp.cgi/Paper/134086
    Last checked: 04/01/2022
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Hutchens, Wendell J.; Booth, Jordan; McCall, David S.
Author Affiliation:Hutchens and McCall: School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA; Booth: Plant Pathology, Physiology, and Weed Science, Virginia Tech, Moseley, VA
Title:Optimizing fungicide application timing for spring dead spot suppression
Section:C05 turfgrass science
Other records with the "C05 turfgrass science" Section

Turfgrass pest management poster: Diseases, insects, weeds (includes student competition)
Other records with the "Turfgrass pest management poster: Diseases, insects, weeds (includes student competition)" Section
Meeting Info.:Salt Lake City, Utah: November 7-10, 2021
Source:ASA, CSSA and SSSA International Annual Meetings. 2021, p. 134086.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Spring dead spot (SDS) (Ophiosphaerella spp.) is the most detrimental disease to warm-season turfgrasses in the transition zone of the United States. Fungicides are often applied in the fall to prevent symptoms the following spring. However, fungicide applications do not provide consistent SDS suppression. One potential reason for this inconsistency is the use of calendar-based fungicide applications instead of the more targeted approach of using both time of year and soil temperature to optimize fungicide application timing. A study was conducted at three separate hybrid bermudagrass (Cynodon dactylon (L.) Pers. x transvaalensis Burtt Davy) locations in Virginia to determine the optimal soil temperature and timing for tebuconazole and isofetamid applications for SDS suppression. One location was infected with O. korrae, and two locations were infected with O. herpotricha. Tebuconazole (1.5 kg a.i. ha-1) and isofetamid (4.1 kg a.i. ha-1) were applied at 11 different timings throughout the year and watered in immediately. Plots were assessed three times in the spring and early summer of 2021 for patch number, percent disease, and turfgrass quality on a scale of 1-9 (1 = dead; 6 = acceptable; 9 = excellent). Data were converted to area under the progress curve, subjected to analysis of variance, and means were separated using the Students t-test when appropriate in JMP Pro 15 [Statistical Analysis Software, Cary, NC, USA]. Isofetamid suppressed SDS more than tebuconazole at all locations. Only the fall applications of isofetamid between 12.8 and 21.1┬░C soil temperatures suppressed SDS compared to the nontreated control at the O. korrae location. Moreover, fall treatments of isofetamid at soil temperatures between 4.4 and 21.1┬░C generally provided the greatest SDS suppression at the O. herpotricha locations. This information will help turf managers optimize the timing of fungicide applications targeting SDS."
Note:"Poster # 1246"
Section "159"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hutchens, W. J., J. Booth, and D. S. McCall. 2021. Optimizing fungicide application timing for spring dead spot suppression. Agron. Abr. p. 134086.
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