| Abstract/Contents: | "A roadside turf containing primarily tall fescue (Festuca arundinacea Schreb.) was treated with ten chemical combinations on May 11, 1988, using a turf utility vehicle-mounted CO2 powered spray boom with flat fan nozzles, delivering the equivalent of 327 l/ha of water. The treatments and application rates are listed in Table 1. Plots were 3 by 9.1 m in size and were arranged in a randomized complete block design with three replications. The soil temperature at 0, 1.3, 2.5, 7.6, and 15.2 cm was 17, 18, 16, 12, and 12 degrees C respectively. Treatments were evaluated for their effects on turf color, seedhead suppression, broadleaf weed control, and quality. Quality ratings summarized turf color, uniformity of the sward, presence of tall fescue seedheads, and the presence of weeds. Ratings were taken on May 27, (2 weeks after treatment, WAT), June 14 (4 WAT), July 14 (9 WAT), and September 27 (20 WAT). Two WAT, there was a significant difference in quality between turf treated with ACP-1911x, which had the highest quality rating, and mefluidide plus metsulfuron methyl (MSM), and mefluidide plus ferromec plus dicamba plus pendimethalin, which had the lowest. The turf trested with mefluidide plus ferromec had a significant amount of seedheads present in at least two of the replications. Untreated tall fescue had produced seedheads by this date. There was a significant difference in turf color between the treatments containing MSM or chlorsulfuron which provided the poorest turf color, and mefluidide plus crop oil which provided the best color. Turf treated with mefluidide plus MSM had the lowest color rating at this date. Four WAT, turf quality for treatments containing ferromec, and mefluidide plus XE-1019 were no different than the untreated check. These treatments did not provide seedhead suppression in any of the plots. An incompatability occurred during mixing of mefluidide plus ferromec plus dicamba, and may have been a factor in the poor seedhead suppression found for these treatments. All other treatments provided significantly better quality than the check. Mefluidide plus MSM provided the highest quality rating. Rated at nine WAT, mefluidide plus MSM, mefluidide plus chlorsulfuron plus dicamba, ACP-1911x, and glyphosate plus chlorsulfuron provided significantly better quality than all other treatments. Quality differences were due to lack of seedhead auppression and broadleaf weed invasion, as there were no significant differences in turf color between any of the treatments. At 20 WAT, turf quality and broadleaf weed presence were ranked for each replication from best to worst. The treatments that provided the best quality rankings were mefluidide plus MSM, mefluidide plus chlorsulfuron plus dicamba, and glyphosate plus chlorsulfuron. Treatments exhibiting the same amount of broadleaf invasion as the check were mefluidide alone, mefluidide plus ferromec, mefluidide plus crop oil, and mefludide plus XE-1019. All other treatments had less broadleaf invasion when compared to the check." |
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