Full TGIF Record # 42129
Item 1 of 1
Publication Type:
i
Report
Author(s):Vincelli, P.; Doney, J. C.
Author Affiliation:Department of Plant Pathology, University of Kentucky
Title:Evaluation of fungicides for control of anthracnose of creeping bentgrass, 1996
Source:Fungicide and Nematicide Tests. Vol. 52, 1997, p. 379.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Abstract/Contents:"The test was initiated on an established sward at the U.K. Agric. Res. Farm near Lexington. The turf was mowed at 0.25 in., irrigated as needed; and fertilized with urea (46-0-0) at 1.5 lb N/1000 sq ft² in Oct & Dec 95. Plots measured 4 x 4 ft with 2-ft borders and were arranged in a randomized complete block design with three replications. All treatments were mixed immediately before spraying, and sprays were applied using a CO²-powered hand-held sprayer fitted with Spray Systems 8003E flat fan nozzles delivering 2.5 gal/1000 sq ft² between 0600-0900h. Control plots were treated with water, then Biotrek sprays were applied, followed by the fungicidal treatments (with appropriate rinses between treatments). Granular materials were applied by hand using a polypropylene bottle with holes drilled through the top. The percentage of foliage with symptoms of anthracnose was estimated visually at biweekly intervals. In order to document disease activity, overall symptom development of the plots was assessed frequently, with particular emphasis on distinguishing brown patch and anthracnose. Randomly selected turf areas with symptoms representative of the entire trial were examined regularly using a field microscope (25-40X), and symptomatic tillers were regularly returned to the lab for microscopic evaluation (6-400X). (All data were analyzed using ANOVA and the Waller-Duncan k-ratio test (P=0.05, k=100) after appropriate transformations; means of arcsine-transformed percentage data are presented in degrees, not percent). Unusually wet weather prevailed through May and the first half of Jun, which was followed by several weeks of hot, humid weather with little rainfall. Cold fronts pushed through the region several times during Jul and August, which were generally cooler than normal. In particular, 90⁰ F was reached on only one day in July. Visual and microscopic observations indicated that anthracnose was present at substantial levels during the evaluation period. Crown infections by Colletotrichum were routinely detected in symptomatic plants. The disease developed from natural inoculum, and disease pressure by mid-Aug was surprisingly severe, given the generally favorable summertime growing conditions. A number of treatments provided excellent control of anthracnose. On 14 Aug, a green alga was observed on necrotic foliage in plots treated with IB-11924; no phytotoxicity nor other unusual effects were observed in the test."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., and J. C. Doney. 1997. Evaluation of fungicides for control of anthracnose of creeping bentgrass, 1996. Fungicide Nematicide Tests. 52:p. 379.
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