Full TGIF Record # 63251
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Publication Type:
i
Report
Author(s):Gleason, M. L.; Peng, G.; Christians, N. C.; Dickson, J. R.
Author Affiliation:Departments of Plant Pathology and Horticulture, Iowa State University, Ames, IA
Title:Evaluation of fungicides for control of pythium blight in perennial ryegrass, 1998
Source:Fungicide and Nematicide Tests. Vol. 54, 1999, p. 517.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Lolium perenne; Pythium diseases; Pythium aphanidermatum; Disease control; Fungicide evaluation; Application rates; Disease severity
Abstract/Contents:"Trials were conducted on perennial ryegrass, maintained at fairway height, at the Iowa State University Horticulture Research Farm near Gilbert, IA. Soil was a Nicollet (fine, loamy, mixed, mesic Aquic Hapludoll). The experimental design was a randomized complete block design with four replications. Each subplot measured 4 ft x 5 ft. The entire plot was inoculated on 23 Jun with rye grain infested with a mixture of two isolates of Pythium aphanidermatum, including one isolate resistant to metalaxyl, according to the protocol of Geisler and Watkins (Phythopathology 87:S33). On 7 Aug, the inoculation was repeated using the same procedure except that four isolates on P. aphanidermatum were used, two of which were resistant to metalaxyl. Immediately after the infested grain was applied, the inoculated area was covered by Seedguard® geotextile fabric for several days (23-24 Jun and 7-10 Aug). Fungicide treatments were applied after the cover was removed. Fungicides were applied with a modified bicycle sprayer at 30 psi and a dilution rate of 5 gal/1000 ft². Fungicide applications after the first inoculation were made on 25 Jun, then repeated at specified intervals on 6, 9, 16, and 23 Jul. A single fungicide application, on 14 Aug, was made after the second inoculation. Weather conditions were conducive to Pythium blight during several periods after the June inoculation, but disease pressure was slight during June and July. Pythium blight symptoms appeared 2 wk after the second inocluation. Disease development on 25 Aug was moderate. Ten treatments had siginficantly (LSD, P=0.05) less disease than the untreated check. No phototoxicity was observed on any of the plots."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gleason, M. L., G. Peng, N. C. Christians, and J. R. Dickson. 1999. Evaluation of fungicides for control of pythium blight in perennial ryegrass, 1998. Fungicide Nematicide Tests. 54:p. 517.
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