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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=119
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Taylorson, R. B. |
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| Author Affiliation: | Adj. Prof., Department of Plant Science, University of Rhode Island, Kingston, RI |
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| Title: | Increasing effectiveness of dithiopyr by sequential applications |
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| Meeting Info.: | Williamsburg, VA; January 2-5, 1996 |
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| Source: | Proceedings of the 50th Annual Meeting of the Northeastern Weed Science Society. Vol. 50, 1996, p. 119. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Crabgrass control; Digitaria ischaemum; Dithiopyr; Herbicide efficacy; Herbicide evaluation; Preemergence herbicides; Weed control
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| Abstract/Contents: | "A field experiment was conducted to examine the efficacy of dithiopyr as a preemergence vs. preemergence plus early-postemergence sequential treatments in controlling smooth crabgrass [Digitaria ischaemum (Schreb.) Muhl.]. The turf was an old stand of mixed Kentucky bluegrass (Poa pratensis L.) and red fescue (Festuca spp.) mowed at 1.75 inches. The experiment was a randomized complete block design with four replications. Plots were five feet wide by eight feet long with a two foot untreated strip between adjacent plots. The soil was a Bridgehampton silt loam. Dithiopyr Ec was applied with a backpack sprayer in 40 gpa. All rates are given in lb ai/A. Preemergence treatments were applied on April 21, 1995. Early-postemergence treatments were applied on June 5, when crabgrass was in the 1-2 leaf stage. Crabgrass stands were heavy. Weed control ratings were on a scale of 0-10 with 10 being perfect control and <7 unacceptable. There was no injury observed. Plots treated at preemergence stage with 0.125, 0.25, 0.38 and 0.5 lb/A gave effective weed control for about 12 weeks, but by 16 weeks the lower rates were beginning to fail and by 20 weeks (maturing crabgrass) were rated <7. Rates of 0.38 and 0.5 lb/A held for 16 weeks but by 20 weeks gave ratings of 7.3 and 8.6 respectively. By applying dithiopyr as a sequential treatment at both the preemergence and early-postemergence stages, the efficacy of dithiopyr on a lb/A basis increased substantially. Sequential treatments of 0.06 + 0.06, 0.09 + 0.09, 0.125 + 0.125, and 0.25 + 0.25 Lb/A were applied. Control ratings after 16 weeks were high for all treatments and by 20 weeks ratings were 7.1, 6.9, 7.9 and 9.8 respectively. A sequential treatment of of 0.25 + 0.125 lb/a gave 20 week ratings of 9.2 as contrasted to 7.3 for a preemergence treatment of 0.38 lb/A. A standard treatment of 0.75 lb/A prodiamine applied preemergence gave a 20 week control rating of 8.6. It is suggested that further improvements in efficacy could be achieved by rate, formulation, and frequency adjustments." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Taylorson, R. B. 1996. Increasing effectiveness of dithiopyr by sequential applications. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 50:p. 119. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=119
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 v. 50 |
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Digitally in TIC by file name: newss1996 |
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