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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: | Watkins: Department of Plant Pathology, Wit: Department of Horticulture, University of Nebraska, Lincoln, NE |
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| Title: | Evaluation of fungicides for control of brown patch, 1998 |
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| Source: | Fungicide and Nematicide Tests. Vol. 54, 1999, p. 527. |
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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; Disease control; Fungicide evaluation; Disease severity; Application rates; Application frequency; Quality; Azoxystrobin; Flutolanil; Propiconazole; Myclobutanil; Triadimefon; Penconazole; Tank mix
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| Abstract/Contents: | "Plots were located on a blend of perennial ryegrasses at the John Seaton Anderson Turf and Ornamental Research Facility at the University of Nebraska Agricultural Research and Development Center near Mead, NE. Plots were mowed three times weekly at a height of 0.62 in. and maintained at 80% ETp. Preemergence weed control was with pendemethalin at 1.5 lb/acre applied 20 Apr. Sulfur-coated urea (32-0-0) was applied 6 Jun at 1 lb N/1000 sq ft. The experiment area was inoculated in late June and again in late Jul with Rhizoctonia solani cultured on sterilized tall fescue seed. The inoculum was delivered with a drop spreader calibrated to deliver 1.5 lb inoculum/1000 sq ft. After inoculation the area was covered with Seed Guard (A. M. Leonard, Inc., Piqua, OH) for 48 hr to raise humidity and encourage disease development. Seed Guard is a white spun-bound polypropylene material used in turfgrass establishment to increase seed germination. Fungicide treatments were applied to 25 sq ft plots using a CO₂ pressurized (30 psi) backpack sprayer with a T-jet No. 8002 flat fan nozzle. The sprayer was calibrated to deliver 5 gal spray solution per 1000 sq ft. Three replications per treatment were arranged in a randomized complete block design. Precipitation was above normal Apr through Jun and below normal Jul and Aug. Temperatures and humidities were near normal in Jun and above normal Jul through Sep. Disease severity was moderate during Jul and Aug. Although the inoculum was applied uniformly with a drop spreader, disease development was not uniform across the plot area. There were significant differences among treatment and turfgrass quality was significantly (negatively) correlated with disease severity. The Heritage 50WG at 0.2 oz applied every 14 days and a tank mix of Bayleton 50DF at 0.25 oz plus Heritage 50WG at 0.2 oz applied every 21 days provided the best control with the lowest disease severity and highest quality ratings." |
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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. 1999. Evaluation of fungicides for control of brown patch, 1998. Fungicide Nematicide Tests. 54:p. 527. |
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