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| Web URL(s): | https://listings.lib.msu.edu/iowat/1991.pdf#page=30
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; Graduate Student and Research Associate, Department of Horticulture, Iowa State University |
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| Title: | Postemergence annual grass control study--1990 |
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| Source: | 1991 Iowa Turfgrass Research Report. July 1991, p. 25-27. |
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| Publishing Information: | Ames, Iowa: Iowa State University |
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| Keywords: | TIC Keywords: Postemergence herbicides; Weed control; Digitaria sanguinalis
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| Abstract/Contents: | "The objective of this study was to investigate the effectiveness of several postemergence annual grass herbicides for the control of crabgrass. Data was also collected on the control of broadleaf weeds. The study was conducted on an area adjacent to the Broadleaf and Postemergence Annual Weed Control Study. The protocols were very similar for the two test sites. The work was conducted on a Nicolett (fine-loamy, mixed-mesic, Aquic Hapludoll) soil with a pH of 6.9 and 2.3% organic matter. Individual plots measured 5 ft by 5 ft. They were arranged in a randomized, complete-block design with three replications. Due to very wet conditions during the study, no additional irrigation was necessary. The grass on the area was a common Kentucky bluegrass that had been in place approximately 20 years. The study area was seeded in the first week of May, 1990, with a combination of large hairy and smooth crabgrass harvested at the research area and white clover (Trifolium repens). Due to the moist conditions, very high populations of both species developed by early June. There was also a native population of dandelion on the test area. Treatments were applied on June 20, 1990, at a time when the crabgrass plants were beginning to form their first tillers. All treatments were applied with a backpack carbon-dioxide sprayer equipped with 8006 nozzles. The spray pressure was 20-25 psi. Treatments were applied with the equivalent of 4 gal water/1000 ft2. Ratings of phytotoxicity on the Kentucky bluegrass were made on July 13, July 20, and August 1 on a scale of 9 to 1. 9 = no damage and 1 = dead turf. Ratings of 6 and above were acceptable. Weed counts were made on August 17, 1990. White clover was rated on a percent cover basis. Table 11 lists the average number of other weeds in a 5 ft by 5 ft plot and the percentage reduction from the control. The only material to seriously damage the Kentucky bluegrass turf was HOE 360-05H, an experimental material from American Hoechst (Table 11). This damage was quite severe, particularly at the 0.9 lb ai/a treatment level. It persisted throughout July and into early August. (Symptoms developed approximately two weeks after treatment.) Crabgrass population was very high on the control plots. The 488 plants per plot represent more than 80% cover. Moisture stress before treatment can often reduce the effectiveness of postemergence annual grass controls. The plot area was very wet during the weeks before treatment and there was no moisture stress on the area at any time during June and July. Crabgrass control was very good for most of the materials studied (Table 11). Acclaim, which has provided somewhat inconsistent control in the last two years when extremely dry conditions existed at the research area, provided 98% crabgrass control in this study. BAS 514 (Impact) at the rates of 0.75 lb ai/a and above was very effective on plots treated with single applications and plots that received repeat treatments 30 days after the initial treatment. This material was also quite effective where repeat applications of levels as low as 0.375 lb ai/a were applied. Scotts S-3061 is a granular fertilizer material that contains BAS 514 (Impact). This granular formulation was very effective as a crabgrass control. The Fermenta 2 + 2 was very effective as a broadleaf control, but provided no reduction of crabgrass. MON 15104 (Dimension) was a very effective postemergence crabgrass control as it has been in studies conducted during the past few years. BAS 514 (Impact) provided excellent broadleaf control in this study. The improved dandelion control compared to the adjacent study (Broadleaf and Postemergence Annual Weed Control Study) appears to be due to the repeat treatments in this study." |
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| Language: | English |
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| References: | 0 |
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| Note: | Entire articl appears as abstract
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Christians, N. E., and R. G. Roe. 1991. Postemergence annual grass control study--1990. Iowa Turfgrass Res. Rep. p. 25-27. |
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| Web URL(s):
https://listings.lib.msu.edu/iowat/1991.pdf#page=30
Last checked: 01/10/2017
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 I55 |
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