Full TGIF Record # 1263
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Author(s):Grisham, M. P.; Toler, R. W.; Bruton, B. D.
Author Affiliation:Assistant Professor, Turfgrass Pathology; and Professor of Plant Virology, The Texas Agricultural Experiment Station, Department of Plant Pathology and Microbiology; and former Graduate Research Assistant, Department of Soil and Crop Sciences, College Station, Texas
Title:St. Augustinegrass downy mildew fungicide field trials
Section:Pests: Disease
Other records with the "Pests: Disease" Section
Source:Texas Turfgrass Research - 1984. 1984, p. 122-127.
# of Pages:6
Publishing Information:College Station, TX: Texas Agricultural Experiment Station.
Series:Consolidated PR 4269-4289
Keywords:TIC Keywords: Stenotaphrum secundatum; Downy mildew; Sclerophthora macrospora; Phytotoxicity; Fenaminosulf; Fungicides
Abstract/Contents:Downy mildew on St. Augustinegrass leaves white linear streaks running parallel to leaf venation. This disease is caused by Sclerophthora macrospora, and several fungicides are being tried for its correction. In this test metalaxyl (Subdue) and fenaminosulf (Lesan) were used to determine their effectiveness in curing or preventing downy mildew. Different rates of both were applied to the test plots. Results show that each rate of metalaxyl applied was effective in reducing downy mildew on St. Augustinegrass. The new growth of the grass blade showed no downy mildew present. Those plots having Lesan applied showed no improvement whatsoever. There was no cure of those blades infected and no preventative cure on new growing blades. On a scale from 1 to 5, the phytotoxicity rate of metalaxyl varied from 1.3 at the lowest application rate to 3.3 at the highest. No phytotoxicity was observed with Lesan. A fall or spring application of metalaxyl showed that a heavier application was best in preventing downy mildew. A 2.0 - 3.0 ox ai.i/1000 2 provided excellent control. The Lesan product had no effect when compared to the control. Metalaxyl is a systemic fungicide which exibits both curative and preventative capabilities for the control of downy mildew. It is possible that only one or two applications a year of metalaxyl will control downy mildew in St. Augustinegrass.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Grisham, M. P., R. W. Toler, and B. D. Bruton. 1984. St. Augustinegrass downy mildew fungicide field trials. Tex Turfgrass Res. p. 122-127.
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