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| Publication Type:
| Report |
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| Author(s): | Watkins, J. E.;
Wit, L. A. |
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| Author Affiliation: | Department of Plant Pathology; and Department of Horticulture, University of Nebraska, Lincoln, NE |
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| Title: | Effect of fungicide treatment and application interval on brown patch development, 1992 |
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| Source: | Fungicide and Nematicide Tests. Vol. 48, 1993, p. 374. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Lolium perenne; Brown patch; Rhizoctonia solani; Fungicide application; Disease evaluation
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| Abstract/Contents: | "Plots were located on a Manhattan ryegrass turf established Sep 1985 at the University of Nebraska John Seaton Anderson turfgrass research facility, Mead, NE. The plot area was inoculated late May with R. solani cultured on sterilized oat seed at the rate of 10 lb oat inoculum per 1000 ft2. The inoculum was applied with a 4-ft Gandy drop spreader. Preemergent weed control was 1 lb dacthal per 1000 ft2 applied early Apr and again in late May. Dicamba, MCPP, and 2,4-D were applied in mid-Oct 1991 for postemergent weed control. Plots were fertilized with 1 lb actual N per 1000 ft2 in mid-Oct 1991 and again with 1 lb N in May and 0.5 lb in Jun and Jul. Irrigation was applied nightly at 1.5 in per week during the growing season. Fungicide applications were initiated 22 Jun and repeated at one, two, or three week intervals until 4 Aug. Products were applied with a CO2-pressurized (25 psi) backpack sprayer with a flat fan nozzle calibrated to deliver 5 gal spray solution per 1000 sq ft. Plot size was 25 sq ft with treatments arranged in a randomized complete block design. Each treatment was replicated four times. Precipitation was above normal from Apr through Sep. Temperatures were generally lower than normal with intermittent periods of hot, humid weather. Brown patch developed rapidly during the growing season and had reached moderately severe levels by mid-Jul. When evaluated at the time of the last fungicide treatment on 4 Aug, brown patch severity was significantly less for all treatments compared to the untreated check. Daconil 2787 Flowable, Bayleton, Broadway and ASC-66518 were continuing to hold the disease at low levels three weeks following the final applications. There were no differences in disease severity between Daconil 2787 Flowable applied weekly at 3 fl oz or biweekly at 6 fl oz. The same trend was noted in the application interval of ASC-66825. No phytotoxicity was noted with any of the treatments listed; however, Banner which was included in the trial but not rated, caused significant stunting and dieback of the turf. It was applied every two weeks at a 4.0 fl oz per 1000 ft2. The extent of the phytotoxicity made it impossible to evaluate disease severity in the Banner-treated plots." |
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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):
Watkins, J. E., and L. A. Wit. 1993. Effect of fungicide treatment and application interval on brown patch development, 1992. Fungicide Nematicide Tests. 48:p. 374. |
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