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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 pythium root rot with top-dressings amended with composts and organic fertilizers, 1991 |
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| Source: | Biological and Cultural Tests for Control of Plant. Vol. 7, 1992, p. 104. |
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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; Pythium root rot; Pythium graminicola; Suppression; Topdressings; Composts; Organic fertilizers
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| Abstract/Contents: | "Field experiments were established in 1991 on a creeping bentgrass sand putting green at the Cornell University Turfgrass Field Research Laboratory to examine the effect of compost-amended topdressings on the severity of Pythium root rot. All composts and organic fertilizers 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 styrofoam cups or plastic bags and stored at room temperature until application to plot areas. Plots were 0.3 m X 0.3 m and were inoculated with Pythium graminicola as follows. A 15-cm-diameter piece of sod was removed from the center of each plot to a depth of approximately 5 cm. As much of the loose soil as possible was removed from the bottom of the sod and returned to the green. Fifty cm3 of inoculum, prepared by growing several geographically diverse isolates of P. graminicola on sterile wheat grain for 14 days, was placed in the hole and the sod then placed back over the inoculum layer. Cores were then tamped to make them flush with the rest of the green surface so that scalping damage could be avoided. Immediately after inoculation on 19 Jun 91, top-dressing formulations were applied at the rate of 1000 cm3/m2 to the entire surface of each of the 0.3 m X 0.3 m plots. Top-dressings 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 sand was applied. Subdue (metalaxyl) was applied as a fungicide standard at the rate of 750 [Mu]g a.i./m2. Approximately 2 cm of irrigation was applied daily through the duration of the experiment. Plots were rated 16 and 26 days after application on a scale of 0-10 for which 0= none of the inoculated are symptomatic whereas 10 = 100% of the inoculated area chlorotic or necrotic. Plots were arranged in a completely randomized design with five replications. Data were analyzed by analysis of variance and means were separated with the LSD test. Only the Sustane (turkey litter compost) and the mature Endicott sludge compost provided significant levels of disease control 16 days after application (July 5). The level of control ranged from 53-58%. Metalaxyl (Subdue) was ineffective in suppressing Pythium root rot. By 26 days after application, both the turkey litter compost and the mature Endicott sludge compost remained suppressive. Additional topdressings suppressive 26 days after application were those amended with the EG manure compost, the immature Endicott sludge compost, the immature brewery compost (AllGrow) and the uncomposted organic fertilizers Compost Plus and Greens Restore. The level of control ranged from 50-93%. Results suggest that applications of some compost-amended or organic fertilizer-amended topdressings may be effective in suppressing Pythium root rot damage in the field." |
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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 pythium root rot with top-dressings amended with composts and organic fertilizers, 1991. Biol. Cult. Tests Control Plant Dis. 7:p. 104. |
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