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| Publication Type:
| Report |
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| Author(s): | Garling, D. C.;
Boehm, M. J.;
Rimelspach, J. W.;
Street, J. R. |
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| Author Affiliation: | Garling, Boehm, and Rimelspach: Department of Plant Pathology, and Street: Department of Horticulture and Crop Science, The Ohio State University |
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| Title: | Impact of compost topdressings and fungicide program on dollar spot severity, 1998 |
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| Section: | Turfgrasses
Other records with the "Turfgrasses" Section
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| Source: | Biological and Cultural Tests for Control of Plant Diseases. 1999, p. 134. |
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| Publishing Information: | St. Paul, MN: The American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Composts; Topdressings; Sewage sludge; Yard waste; Fungicides; Disease severity; Disease control; Dollar spot; Agrostis stolonifera; Chlorothalonil
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| Abstract/Contents: | "An 11,000 ft² creeping bentgrass plot was established in Jun 1996 at The Ohio State University Turfgrass Research and Education Facility, Columbus, on a clay loam soil. The experimental design was a 3x2x3x3 complete factorial with nitrogen fertility as the main plot factor, core aerification as the sub-plot factor, and compost topdressing and pesticide spray application programs as the two sub-sub plot factors applied in strips. A total of 54 treatments were compared (n=3). Nitrogen rates were applied at 1, 2 and 4 lb N/1000 ft². One-half of each main plot was core-aerated (spring and fall @ 20-25 cores/ft²) immediately prior to topdressing. The topdressings used in this study included a composted sewage sludge (biosolid) and a 50:50 biosolid-yardwaste blend were applied in May and Sep at a rate equal to a depth of 1/8 in. All plots were verticut following topdressing to blend the cores and compost prior to dragging. All plots were irrigated immediately following topdressing applications. Excessive thatch and bulking agent was removed by mowing. Pesticides were applied on either a preventative (label rate/timing) or an as-needed (IPM) schedule based on scouting. IPM plots were sprayed for dollar spot when a minimum of five spots were visible and favorable weather conditions for disease development were forecasted. Chlorothalonil (Daconil Ultrex, Zeneca Ag. Products, Wilmington, DE) was used for all fungicide applications at a rate of 1.84 oz/1000 ft². Plots were maintained at 0.5 in. with a triplex mower (clippings removed). Dollar spot severity was assessed using a grid method in which each plot was sectioned into 572 quadrants and the number of infected quadrants counted and reported as % area infected. Nitrogen fertility and core aerification did not significantly (P=0.05) impact dollar spot severity in 1998, although such differences existed in 1997 (data not shown). Dollar spot severity was significantly reduced when the disease epidemic occurred 4-6 weeks after the compost topdressings were applied. This reduction is disease resulted in a significant reduction in the number of chlorothalonil applications needed to manage dollar spot in the IPM versus the preventative maintained plots." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: TOPDRS |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Garling, D. C., M. J. Boehm, J. W. Rimelspach, and J. R. Street. 1999. Impact of compost topdressings and fungicide program on dollar spot severity, 1998. Biol. Cult. Tests Control Plant Dis. p. 134. |
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