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| Web URL(s): | https://listings.lib.msu.edu/iowat/1991.pdf#page=37
Last checked: 01/10/2017
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Christians, N. E.;
Roe, R. G. |
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| Author Affiliation: | Professor, Turfgrass Science, Research and Teaching, Department of Horticulture; Graduate Student and Research Assistant, Department of Horticulture, University of Iowa |
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| Title: | Effects of Dithiopyr (Dimension) on the rooting of creeping bentgrass |
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| Source: | 1991 Iowa Turfgrass Research Report. July 1991, p. 32-34. |
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| Publishing Information: | Ames, Iowa: Iowa State University |
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| Keywords: | TIC Keywords: Preemergence herbicides; Postemergence herbicides; Rooting; Weed control
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| Abstract/Contents: | "Dithiopyr (Dimension) is a new herbicide likely to be labeled for use on Kentucky bluegrass and other turf species in 1991. It functions both as a preemergence and early postemergence control of crabgrass. Trials with this compound on creeping bentgrass have been limited and little is known about the response of bentgrass to this compound at green-mowing height. The objectives of this study were to observe rooting responses and foliar phytotoxicity to dithiopyr on creeping bentgrass mowed at 3/16-in and maintained under putting green conditions. The turf was a 10-year-old stand of 'Penncross' creeping bentgrass established on a 1:1:1 (sand:soil:peat) soil mixture with a pH of 7.1. (Three plots of each replication extended into an adjacent area of 'Penneagle' creeping bentgrass. Observations during the study indicated no variation in response and these plots were included in the analysis.) The area received 3-4 lb N/1000 ft2 in 0.2 lb increments as needed. No P or K was applied. Standard fungicide and insecticide treatments were made uniformly on all plots. Each plot measured 5 ft by 5 ft and the study was replicated three times. Treatments were applied on May 9, 1990, with a carbon-dioxide backpack sprayer (Table 14). The plots were observed for signs of visible treatment differences throughout the summer. At no time were there any signs of phytotoxicity. There was an initial positive response due to the granular formulations of dithiopyr in some replications. This appeared to be due to a nutritional stimulation of the grass by the carrier. These responses were not consistent enough to be significant. Root samples were collected on June 9 and August 5 to a depth of 20 cm. The diameter of the cores was 2.54 cm and six cores were collected per plot. The samples were divided into four subsamples: 0-5, 5-10, 10-15, and 15-20 cm. All soil was washed from the root samples. Samples were dried, weighed, and ashed at 500[degrees]C. Root weights were reported as the difference between ashed and dry weights. Rooting varied by depth on June 9, but was not affected by herbicide treatment. Rooting on August 5 varied with depth, and all herbicide-treated bentgrass showed significantly reduced root weight from the control. There were no differences in rooting among herbicide treatments. Bensulide is a labeled compound for use on bentgrass greens and was used as a standard in this trial. Root weights of dithiopyr treated bentgrass were generally equal to or greater than that of Bensulide-treated plots. This information combined with the lack of visible phytotoxicity would indicate that dithiopyr is probably as safe as Bensulide for use on these varieties of creeping bentgrass maintained at green height." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Christians, N. E., and R. G. Roe. 1991. Effects of Dithiopyr (Dimension) on the rooting of creeping bentgrass. Iowa Turfgrass Res. Rep. p. 32-34. |
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| Web URL(s):
https://listings.lib.msu.edu/iowat/1991.pdf#page=37
Last checked: 01/10/2017
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 I55 |
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