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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=186
Last checked: 07/15/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Boyd, J. W. |
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| Author Affiliation: | University of Arkansas Cooperative Extension, Fayetteville, AR |
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| Title: | Early postemergence crabgrass control with pendimethalin and dithiopyr |
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| Section: | Weed control in turf, pasture, and rangeland
Other records with the "Weed control in turf, pasture, and rangeland" Section
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| Meeting Info.: | Houston, Texas: January 27-29, 2003 |
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| Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 100. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Comparisons; Crabgrass control; Dithiopyr; Herbicide efficacy; Herbicide evaluation; Pendimethalin; Postemergence weed control
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| Abstract/Contents: | "In 2002, we conducted three field trials and one greenhouse trial in Fayetteville, Arkansas to compare the effectiveness of pendimethalin at 1.5 lb ai/a and dithiopyr at 0.25 lb ai/a for postemergence control of seedling crabgrass. Field trials were conducted with large crabgrass (Digitaria sanguinalis ). The greenhouse trial included large crabgrass and smooth crabgrass (Digitaria ischaemum ). Herbicides (1.29% pendimethalin and 0.17% dithiopyr) were on a 30-3-4 fertilizer. The field trials were planted on an irrigated, vegetation free site that had been fumigated with methyl bromide in the fall of 2001. The greenhouse trial was planted in plastic growth trays using 85:15 sand: peat mix. Percent crabgrass cover was determined using overhead digital photographs of each plot and analyzing them using SigmaScan® software. SigmaScan® counts the number of green pixels (crabgrass) in the digital photo and divides it by the number of total pixels to calculate a percent crabgrass cover in the plot. Pendimethalin at 1.5 lb ai/a and dithiopyr at 0.25 lb ai/a provided effective early postemergence large crabgrass control when applied at the one to two-leaf stage of growth but were ineffective when applied at the three-leaf stage or later. Th is was due in part to the absence of turfgrass competition. However, the absence of other species allowed quantitative measurement of herbicide performance compared to the more subjective visual evaluation process used when turfgrass is present. At 10 DAT (days after treatment) in field trials I, II and III, percent large crabgrass cover in plots treated with dithiopyr at the one to two-leaf stage of crabgrass growth was 7, 18 and 1%, respectively. Percent cover for pendimethalin was 11, 4 and 0%, respectively. If treatment was delayed until the one to three-leaf stage of crabgrass growth, percent cover for dithiopyr and pendimethalin at 10 to 16 DAT ranged from 40 to 80% across all field trials. In field trial I, 0.25 lb ai/a of an emulsifiable concentrate (1EC) and wettable powder (40WSP) formulations of dithiopyr applied as a spray at 30 GPA did not provide better control than dithiopyr applied on fertilizer granules. In a separate field trial, three formulations of pendimethalin (3.3EC, 60DF and 2G) were applied to one to three-leaf large crabgrass at 1.5 lb ai/a. At 20 DAT , these treatments had 7, 31 and 88% cover, respectively. The EC and DF formulations were applied at 30 GPA. Pendimethalin, applied at the one-leaf stage, in the greenhouse, provided significantly better control of smooth crabgrass than dithiopyr (97% vs. 50% at 10 DAT). Control of one-leaf large crabgrass was not statistically different (87% vs. 73% at 10 DAT). Greenhouse control ratings were visual where 0 = no weed control and 100 = complete weed control." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Invasive weeds: Real or imagined threat?"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Boyd, J. W. 2003. Early postemergence crabgrass control with pendimethalin and dithiopyr. South. Weed Sci. Soc. Proc. 56:p. 100. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=186
Last checked: 07/15/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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