Full TGIF Record # 36319
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Web URL(s):https://gsr.lib.msu.edu/1950s/1951/510828.pdf
    Last checked: 10/2002
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Publication Type:
i
Professional
Content Type:Abstract or Summary only
Author(s):Rowell, John B.
Title:Brown patch observations on bentgrass
Section:Turf management
Other records with the "Turf management" Section
Source:USGA Journal and Turf Management. Vol. 4, No. 4, August 1951, p. 28-29.
Publishing Information:New York: United States Golf Association
# of Pages:2
Keywords:TIC Keywords: Agrostis; Guttation fluid; Rhizoctonia solani; Disease control; Fungicide application; Fungus control; Phenylmercury acetate
Abstract/Contents:"Wounds produced by the frequent mowing of bentgrass greens and the guttation drops produced on the tips of the grass blades are important factors in the development of brownpatch (Rhizoctonia solani), according to research findings by Dr. Rowell at the Rhode Island Agricultural Experiment Station. Critical greenhouse studies which included inoculation with R. solani in a moisture chamber under favorable temperatures (75° to 85°F), showed severe brownpatch injury on the cut bentgrass while the uncut bentgrass remained relatively free of infection. The fungus was observed to originate at the tip of the cut blade and progress downwards towards the center of the plant. Guttation drops appeared to be a second important factor in contributing to the rapid spread of brownpatch. These drops occur mainly when the roots absorb water rapidly and the rate of transpiration is reduced. Such conditions are pronounced during hot, humid weather, when the sky is overcast and the wind movement virtually is non-existent. Under these favorable factors the guttation drops may persist throughout the daylight hours. The drops contain dissolved salts and organic materials which serve as an ideal cultural medium for development of the disease. All severe brownpatch infections observed in these studies occurred when the turf was moist with guttation drops. Golf course superintendents long have known that poling and hosing the greens in the early morning are of definite value in minimizing the development of disease. The protective action of these control measures readily can be explained by the dispersion and subsequent rapid drying of the moisture and nutrients of the guttation drops which no longer can give impetus to the spread of disease. Laboratory studies further indicated that brownpatch development during periods of excessive guttation complicated fungicidal control measures. This especially was the case with phenyl mercury compounds which were inactivated by glutathione, an ingredient present in guttational water. This inactivation would explain certain inconsistencies observed by superintendents and pathologists using phenyl mercury compounds to control brownpatch."
Language:English
References:0
Note:Original article appears in Plant Disease Reporter, May 15, 1951
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rowell, J. B. 1951. Brown patch observations on bentgrass. USGA J. Turf Manage. 4(4):p. 28-29.
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https://gsr.lib.msu.edu/1950s/1951/510828.pdf
    Last checked: 10/2002
    Requires: PDF Reader
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MSU catalog number: SB 433.15 .U84
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