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| Publication Type:
| Report |
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| Author(s): | Grogan, J. E.;
Scott, D. H. |
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| Author Affiliation: | Department of Botany and Plant Pathology, Purdue University |
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| Title: | Evaluation of fungicides for control of summer decline in annual bluegrass, 1996 |
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| Source: | Fungicide and Nematicide Tests. Vol. 52, 1997, p. 382. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Fungicide treatments were evaluated on a golf course fairway at the Purdue University South Course, West Lafayette, IN. The turf area, 70-80% Poa annua and 20-30% Lolium perenne, received conventional golf course care and was maintained at a height of 3/4 in. The test area was fertilized with 4.0 lb N/1000 sq ft/yr. Soil type was Miami clay loam with a pH of 5.8. Treatments were applied to 3.3 ft x 6.6 ft plots arranged in a randomized complete block design with 4 replications. A hand held CO²-pressurized sprayer with two 11003 LP flat fan nozzles, spaced 19 in. apart, at 22 psi and at a rate of 3 gal/1000 sq ft was used to apply the fungicide treatments. All treatments were applied on 3 Jul and 21 days later on 24 Jul. Disease ratings were made by visually estimating the percentage of the plot area affected by disease symptoms. Cool, wet conditions in the spring were followed by a cool and dry summer. Day-time air temperatures rarely exceeded 90⁰ F; night-time temperatures usually were between 55-65⁰ F. Irrigation was applied to prevent drought stress. Root and crown tissues of diseased plants were surfaced sterilized with silver nitrate and placed in dilute PDA amended with antibiotics to recover pathogenic ectotropic fungi on a weekly schedule. Diseased root tissue was also surface sterilized with a dilute sodium hypochlorite solution, placed in water agar and isolations of fungi were transferred to PDA. Magnaporthe poae, Curvularia spp, Rhizoctonia solani and Pythium spp were routinely collected. R. zeae, collected in 1995, was not observed. Darkly pigmented ectotropic hyphae and hyphopodia were observed in the stele of diseased roots under the microscope. Summer decline in annual bluegrass at this research site probably involves several pathogenic fungi and environmental stresses which remain to be determined. Disease severity was much lower this year than in 1995, likely related to cool night-time temperatures. Disease development was slow until after the first week of Aug when disease severity reached a moderate level. Fungo 50F and Heritage 50 WG were the best treatments for the control of summer decline. No phytotoxicity was observed." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Grogan, J. E., and D. H. Scott. 1997. Evaluation of fungicides for control of summer decline in annual bluegrass, 1996. Fungicide Nematicide Tests. 52:p. 382. |
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