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| Publication Type:
| Report |
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| Author(s): | Nelson, E. B.;
Craft, C. M. |
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| Author Affiliation: | Department of Plant Pathology, Cornell University, Ithaca, NY |
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| Title: | Suppression of dollar spot with top-dressing amended with composts and organic fertilizers |
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| Source: | Biological and Cultural Tests for Control of Plant. Vol. 6, 1991, p. 93. |
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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: Poa annua; Dollar spot; fertilizers; Topdressings; Disease control
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| Abstract/Contents: | "Field plots were established in 1989 on an annual bluegrass/creeping bentgrass putting green at the Country Club of Rochester, Rochester, NY to evaluated various composts and organic fertilizers as amendments to top-dressings for the biological control of dollar spot. The putting green was over 60-yr old and constructed from the native alkaline clay loam soil (pH 7.2) in the area. The green contained largely annual bluegrass intermixed with small percentages of bentgrasses and was naturally infested with S.homoeocarpa. The following fertilizers were applied: a 18-4-10 fertilizer on 12 May and 12 Jun at the rate of 146 kg/ha and a liquid 28-8-18 on 19 Sep at the rate of 86 L/ha. As part of the regular maintenance program, turf was maintained at a 5mm cutting height and the green aerified (0.6 cm diameter tynes) one day prior to application of treatments. Top-dressing formulations consisted of 70% fine sand and 30% organic component (v:v) and were applied on 25 May to 0.9 X 0.9 m2 plots at the rate of 500 cm3/m2. Treatments were applied at monthly intervals thereafter. Top-dressings were distributed by hand as uniformly as possible over the plot area then lightly rubbe-in to distribute the mixture into the turf canopy. Controls consisted of plots to which no top-dressing was applied. Propiconazole (1-[(2-(2,4-dichlorpphenyl)-4-propyl -1,3-dioxolan-2yl)methyl]-1H-1,2,4-triazole)(Banner) was applied as a fungicide standard at the rate of 173 mga.i./m2. All plots were then watered-in by applying 0.6 cm of irrigation. Plots were evaluated on 26 Jun and again on 19 Jul for dollar spot severity by counting the number of infection foci per plot. All field experiments were established as a randomized complete block design with five replicates. Data were analyzed by analysis of variance and means were separated using the Least Significant Difference (LSD) test. Only top-dressing amended with Ringer Compost Plus and Ringer Greens Restore significantly suppressed dollar spot development as compared to untreated plots on both evaluation dates. The level of disease control at both evaluation dates was as good as that provided by the fungicide, Banner. Top-dressings formulated with composts prepared from sewage sludges, animal manures, leaves, spent mushroom or brewery waste were ineffective in suppressing dollar spot. We conclude that some organic fertilizers may reduce damage from dollar spot when applied to putting greens as a top-dressing." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Nelson, E. B., and C. M. Craft. 1991. Suppression of dollar spot with top-dressing amended with composts and organic fertilizers. Biol. Cult. Tests Control Plant Dis. 6:p. 93. |
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