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| Publication Type:
| Report |
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| Author(s): | Sanders, P. L.;
Soika, M. D. |
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| Author Affiliation: | Department of Plant Pathology, The Pennsylania State University, University Park, Pennsylvania |
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| Title: | Biological control of pythium blight |
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| Source: | Biological and Cultural Tests for Control of Plant. Vol. 6, 1991, p. 99. |
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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: Lolium perenne; Pythium diseases; Biological control; Fertilizers
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| Abstract/Contents: | "Biological control agents were evaluated at the Landscape Management Research Center, University Park, PA, on a mixture of perennial ryegrasses, maintained under home lawn/ golf course fairway management conditions. The experimental area was fertilized on 5 Jun with 0.5 lbs. actual N(NH4NO3) per 1000 sq ft. Individual treatments plots, 5 ft x 5 ft, were arranged in a randomized complete block design with five replications. To avoid cross-contamination between individual treatments, 1 ft wide buffer strips separated all plots, and grass clippings were collected throughout the experiment. Individual strains of living microorganisms, formulated on granular carriers, were hand-scattered from shaker-top jars onto individual plots on 21 Jun and 5 and 15 Jul. A standard registered Pythium blight fungicide (Subdue 2G) was applied on 11, 15, and 27 Jul, and untreated checks were included for comparison purposes. Following each round of treatments, the experimental areawas irrigated with 0.5 inches of water. To monitor the presence of the biocontrol agents, soil samples were taken prior to treatment (19 Jun) and post-treatment on 26 Jun, 5 Jul, and 16 Aug. The entire experimental area was inoculated with a 6-isolate pool of Pythium aphanidermatum on 15 Jul. Following inoculation, the inoculated area was covered with a 30 ft x 50 ft, polyethylene greenhouse to minimize radiational cooling at night, and equipped with intermittent misting to supply continuous high relative humidity. Temperature and humidity in the greenhouse were monitored throughout the test with a hydrothermograph placed at ground level. Percent of individual plot areas blighted was assessed on 30 Jul and 6 Aug. Data obtained were subjected to analysis of variance and Waller-Duncan K-ratio test. Daytime temperatures throughout the incubation period ranged between 90-100F, nighttime temperatures between 60-70F, and relative humidity between 70-90%, with the 70% low occurring at mid-day. At the first disease assessment (30 Jul), one of the bicontrol agents, ASC 66912, was providing Pythium blight control that was not significantly different from the Subdue standard. By 6 Aug, however, the disease had progressed and intensified, and although some of the biocontrol agents were still providing statistically significant blight reduction, only Subdue was giving a commercially acceptable level of disease control." |
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| Language: | English |
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| References: | 0 |
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| Note: | Reprint appears in Turfgrass Research Results 1990/1991 [Penn State], 1991, p. 39-40
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sanders, P. L., and M. D. Soika. 1991. Biological control of pythium blight. Biol. Cult. Tests Control Plant Dis. 6:p. 99. |
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