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| Web URL(s): | https://turf.rutgers.edu/wp-content/uploads/2023/03/symposium-2019.pdf#page=54
Last checked: 07/31/2023
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Zhang, Pingyuan;
Genova, Kyle;
Hempfling, James W.;
Clarke, Bruce B.;
Murphy, James A. |
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| Author Affiliation: | Department of Plant Biology, Rutgers University |
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| Title: | Dollar spot control as affected by fungicide programming and bentgrass susceptibility |
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| Meeting Info.: | New Brunswick, New Jersey: January 11, 2019 |
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| Source: | Proceedings of the Twenty-Eighth Annual RutgersTurfgrass Symposium. January 11 2019, p. 54. |
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| Publishing Information: | New Brunswick, New Jersey: The Center for Turfgrass Science, Rutgers, The State University of New Jersey |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Dollar spot epidemics, caused by Clarireedia jacksonii (formerly known as Sclerotinia homoeocarpa F.T. Bennett), differ in incidence and severity among bentgrass (Agrostis spp.) cultivars. A field trial was conducted in North Brunswick, NJ to assess the effectiveness of using threshold-based fungicide applications to control dollar spot among bentgrasses ranging in susceptibility to dollar spot. A 6 x 3 factorial arranged in a randomized complete block design with four replications was used for this field trial. The six bentgrass cultivars ranging in susceptibility to dollar spot included 'Capri' colonial bentgrass (A. capillaris), and 'Declaration', '007', 'Shark', 'Penncross' and 'Independence' creeping bentgrass (A. stolonifera); cultivar plots were established in 2015. Three fungicide programs were applied to all cultivars and included a calendar-based and two curative programs based on a damage threshold of 314-mm2 over all four replications. Fungicide was applied every 21-days from 21 May through 4 Nov. 2018 for the calendar-based program. The two curative programs differed in the timing of fungicide application: one program applied fungicide within 24-hours of reaching the damage threshold and the other applied fungicide on the next scheduled spray-day (Monday) after the damage threshold was reached. Disease severity was measured as the active dollar spot infection area within a 0.6- by 1.2-m area of each plot every 1 to 3 days and summarized for the growing season by calculating the area under disease progress curve (AUDPC) from 15 May to 6 Nov. 2018. Fungicide programs had a strong influence on disease response to bentgrass cultivar. In general, the most effective dollar spot control was achieved by the calendar-based fungicide program while the least effective disease control was observed on threshold-based applications on the next spray-day. The AUDPC was not different between cultivars for either the calendar or 24-hour threshold programs; and the calendar-based and 24-hour threshold programs did not differ in AUDPC, albeit AUDPC was numerically greater for the 24-hour threshold program. However, the number of sprays for the 24-hour threshold program was lower than the calendar-based program and varied with cultivar. Curative fungicide applications on the next spray-day also reduced the total number of fungicide applications compared to the preventive calendar-based program. However, the level of disease control under the next spray-day program was not as effective as either the calendar-based program or curative applications within 24-hours of the damage threshold for most cultivars. Penncross had the greatest disease severity whereas Declaration had the lowest severity under the next spray-day program; approximate disease severity ranking among other cultivars (high to low) was Shark ≥ Capri ≥ Independence ≥ 007. Declaration (least susceptible) was the only cultivar that had a similar level of disease control under all three fungicide programs. Nine fungicide applications were made in the calendar-based program while curative applications resulted in two to three sprays (next spray-day vs 24 hours, respectively) on Declaration; four sprays on Capri, 007 and Shark; four to five sprays on Penncross (next spray-day vs 24 hours, respectively); and six sprays on Independence. This trial will be continued in 2019." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zhang, P., K. Genova, J. W. Hempfling, B. B. Clarke, and J. A. Murphy. 2019. Dollar spot control as affected by fungicide programming and bentgrass susceptibility. Proc. Rutgers Turfgrass Symp. p. 54. |
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| Web URL(s):
https://turf.rutgers.edu/wp-content/uploads/2023/03/symposium-2019.pdf#page=54
Last checked: 07/31/2023
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b3696858 |
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