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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Nelson, E. B.;
Craft, C. M. |
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| Author Affiliation: | Dept. of Plant Pathology, Cornell University, NY |
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| Title: | Suppression of dollar spot with top-dressing amended with composts and organic fertilizers, 1990 |
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| Source: | Biological and Cultural Tests for Control of Plant. Vol. 7, 1992, p. 103. |
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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: Agrostis stolonifera; Dollar spot; Sclerotinia homoeocarpa; Suppression; Topdressing; Composts; Organic fertilizers
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| Abstract/Contents: | "Field plots were established in 1990 on an experimental creeping bentgrass (Agrostis palustris Huds. 'Seaside')/annual bluegrass (Poa annua L.) putting green at the Cornell University Turfgrass Field Research Laboratory, Ithaca, NY to evaluate various composts and organic fertilizers for the suppression of dollar spot. The green was mowed at 5 mm cutting height and aerified (0.6-cm-diameter tynes) one day prior to application of treatments. No fertilizer applications were made in 1990 prior to or following the establishment of treatments. One application of fosetyl Al was made on 23 May 90 at the rate of 0.73 g a.i./m2 to control root-rotting Pythium species. All materials tested were screened to pass through a 2.0 mm-opening sieve prior to use in topdressing mixtures. Organic components were mixed with fine quarry sand (pH 7.5) in the proportions of 30% organic component and 70% sand (v:v). This mixture was chosen to represent the maximum amount of organic matter that would typically be applied to a golf course putting green during commercial topdressing applications. Topdressings were placed in small capped styrofoam cups or plastic bags and stored at room temperature until application to plot areas. Propiconazole (Banner(R)) was applied as a fungicide standard at the rate of 0.17 g a.i./m2. Preventive dollar spot treatments were applied on 5 Jun 90 to 0.6 m X 0.6 m plots at the rate of 500 cm3 of topdressing formulation per m2. Topdressings were distributed by hand as uniformly as possible over the plot area then lightly rubbed-in to distribute the material into the turf canopy. Controls consisted of plots to which no topdressing was applied. All plots were then watered by applying 0.6 cm of irrigation. Plots were rated for dollar spot incidence 19 and 63 days after application by counting the number of infection foci per plot. All plots were arranged in a randomized complete block design with five replications. Data were analyzed by analysis of variance and means were separated using the LSD test. Dollar spot symptoms were slow to develop; symptoms did not appear in untreated plots until early September. Despite the low level of dollar spot incidence at the first rating (4 Sep 90), all composts and organic fertilizers tested, with the exception of the MH horse manure compost, reduced the incidence of dollar spot. The level of control among all composts ranged from 33-100%. By 63 days after the last application in August, disease incidence was substantially greater. However, there was significant variability among treatment replicates and, as a result, few treatments provided a significant level of dollar spot suppression as compared with untreated plots. Only Sustane (turkey litter compost) remained suppressive 63 days after application. The level of control among all composts tested and organic fertilizers tested ranged from 0-54.6%. Although differences among other treatments were not statistically significant, fewer dollar spot infection foci were found in plots treated with Compost Plus, the Endicott sludge compost, or Banner. Results suggest that topdressings amended with composts or organic fertilizers may be effective in suppressing dollar spot in the field and may provide levels of control equivalent to that of fungicides." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Nelson, E. B., and C. M. Craft. 1992. Suppression of dollar spot with top-dressing amended with composts and organic fertilizers, 1990. Biol. Cult. Tests Control Plant Dis. 7:p. 103. |
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