Full TGIF Record # 30509
Item 1 of 1
Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Holcomb, G. E.; Shepard, D.
Author Affiliation:Department of Plant Pathology and Crop Physiology; Department of Horticulture, LA Agricultural Experiment Station, LA State University Agricultural Center, Baton Rouge
Title:Reaction of St. Augustinegrass cultivars and selections to gray leaf spot, 1992
Source:Biological and Cultural Tests for Control of Plant. Vol. 8, 1993, p. 121.
Publishing Information:St. Paul, MN: The American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Stenotaphrum secundatum; Gray leaf spot; Pyricularia grisea; Cultivars; Susceptibility
Abstract/Contents:"Twenty-seven St. Augustinegrass cultivars and selections were planted and maintained in 1990 at Burden Research Plantation as part of a national St. Augustinegrass variety trial. The experimental plot contained three blocks in which each selection was replicated three times as a 5 x 10 ft plot. All blocks were treated the same during the growing season in respect to mowing, irrigation and fertilization. Pesticides were not used on the plots except for edging with herbicide to keep the grasses within the 5 X 10 ft areas. Pyricularia grisea inoculum was from natural sources. P. grisea leaf spot counts were made Jul 9 by counting the total number of spots present in two random 25 cm2 areas of each replicate (six readings per selection). Data were subjected to an analysis of variance and Duncan's multiple range tests. Significant differences were again observed among the selections in their susceptibility to gray leaf spot. Disease pressure was higher in 1992 than in 1990 and gave a better indication of resistance or susceptibility. The same seven selections (Floratam, Floralawn, FX-10, FX-33, FX-261, FX-313, TR 6-10) occurred in the group of seven most resistant grasses both years. Additionally, this group would now include Raleigh, Seville and FX-332. Selections M1, S-6-71-107, TR6-3, Jade, and Sunclipse appeared comparatively resistant under low disease pressure in 1990, but all were comparatively susceptible in the 1992 test. These variations suggest that a disease pressure that results in about 200 leaf spots/ 25 cm2 on the most susceptible selections is necessary to obtain valid results."
Language:English
References:0
Note:Table
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Holcomb, G. E., and D. Shepard. 1993. Reaction of St. Augustinegrass cultivars and selections to gray leaf spot, 1992. Biol. Cult. Tests Control Plant Dis. 8:p. 121.
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