Full TGIF Record # 42142
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Publication Type:
i
Report
Author(s):Tisserat, N. A.; Pair, J. C.
Author Affiliation:Department of Plant Pathology and Division of Horticulture, Forestry, and Recreational Resources, Kansas State University
Title:Preventive fungicide applications for control of rhizoctonia brown patch of tall fescue, 1996
Source:Fungicide and Nematicide Tests. Vol. 52, 1997, p. 391.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Abstract/Contents:"Fungicides were evaluated on an established stand of tall fescue (blend of three unidentified cultivars) at the Horticulture Research Station, Wichita, KS. Applications were made on 18 Jun and continued at 2- or 4-week intervals through 1 Aug. Fungicides were applied with a CO²-powered backpack sprayer with 8003 Teejet nozzles at 30 psi in water equivalent to 2.9 gal/1000 sq ft. Plots were not irrigated after applications. Plots were 6 ft x 10 ft and arranged in a randomized complete-block design with three replications. Plots were rated every 2 weeks for the percent area damaged. Brown patch severity was low throughout June and July (data not presented), but then increased in August and September because of relatively hot, humid conditions. All fungicide treatments suppressed brown patch severity on 1 Aug. Applicatins of Heritage 50WP and Prostar 50WP at 28-day intervals were as effective in controlling brown patch as any fungicide treatment applied at 14-day intervals. Applications of Prostar at 2 oz/1000 sq ft on a 14-day interval resulted in significant (9.0%) plot discoloration from Pythium blight (Pythium sp.) on 1 Aug. Pythium blight was not observed in other fungicide-treated plots in this study but did occur in adjacent, spring-seeded tall fescue plots treated with Prostar at similar rates. This suggests that Prostar predisposed tall fescue to Pythium blight. Applications of Daconil Ultrex and Daconil 2787 resulted in a yellowing of the turfgrass beginning in late June and continuing until 1 Aug. All fungicide treatments gave excellent control of brown patch two weeks (16 Aug) after the last application date (1 Aug). However, only Bayleton at 2 oz, both formulations of Daconil, the 3 oz rate of Prostar, and both rates of Heritage gave aesthetically acceptable (<15%) levels of brown patch control 4 wk after the last fungicide application."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Tisserat, N. A., and J. C. Pair. 1997. Preventive fungicide applications for control of rhizoctonia brown patch of tall fescue, 1996. Fungicide Nematicide Tests. 52:p. 391.
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