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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1997_vol51.pdf#page=126
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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| Author(s): | Spackman, Chad W.;
Johnson, Jon M.;
Kuhns, Larry J. |
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| Author Affiliation: | Research Technologist, Project Assistant, and Professor of Ornamental Horticulture, The Pennsylvania State University |
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| Title: | Evaluation of imazameth for weed control in wildflower establishment |
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| Meeting Info.: | Newport, RI; January 6-9, 1997 |
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| Source: | Proceedings of the 51st Annual Meeting of the Northeastern Weed Science Society. Vol. 51, 1997, p. 126-127. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Establishment rate; Herbicide efficacy; Herbicide evaluation; Imazameth; Postemergence weed control; Preemergence weed control; Wildflowers
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| Abstract/Contents: | "As part of a cooperative project between the Pennsylvania State University and the Pennsylvania Department of Transportation, a study was initiated to evaluate imazameth₂/] at 0.094 and 0.188 lbs/ac for both pre and postemergent weed control in establishment of annual wildflowers. All treatments contained a surfactant₃/] and drift control agent₄]. The study area was located at Penn State's Landscape Management Research Center and was arranged in a randomized complete block design with three replications. The area was treated with 4 lbs/ac glyphosate on May 6, 1996, to control all existing vegetation. On May 20 it was rototilled to a depth of 8 in, and seeded with an annual wildflower mix containing cosmos (Cosmos bipinnatus Cav.), cornflower (Centaurea cyanus L.), corn poppy (Papaver rhoeas L.), rocket larkspur (Delphinium ajacis L.), sweet alyssum (Dianthus barbatus L.), and tall plains coreopsis (Coreopsis tinctora Nutt.) at 14 lbs/ac. Preemergent treatments were applied May 31, as a few cosmos seedlings were emerging to 6 by 10 ft plots using a CO₂-powered hand held sprayer equipped with Spraying Systems XR 8004 VS spray tips, delivering 40 GPA at 35 psi. Postemergent treatments were applied June 28 and all wildflower species, except rocket larkspur, were present within the treated plots. Predominant weeds included smooth pigweed (Amaranthus hybridus L.), common yellow woodsorrel (Oxalis stricta L.), green foxtail (Setaria viridis L.), common lambsquarters (Chenopodium album L.) and common dandelion (Taraxacum officinale L.), and were uniformly mixed among the flowers. Ground cover ratings and average canopy heights of both wildflowers and weeds were taken June 28, July 25, and September 11. Results of the weed ratings are reported in Table 1a and wildflower ratings in Table 1b. Imazameth provided excellent preemergence weed control through the September rating period. Compared to the untreated check, the postemergence applications reduced weed height at the July rating, but not weed cover. By September, there were no differences in weed cover or height between the postemergence treated areas and the untreated check. Ground cover by wildflowers was not significantly different for treatments at either the June or September rating periods, however the 0.188 lb/ac post treatment had less cover in July than the pre and untreated plots. Pre treatments provided the lowest wildflower canopy heights in June but were not different from the check in September, while the post treated plots stunted the wildfloweres and provided the lowest canopy heights in both July and September. Overall, there was little difference between application rate for either the pre or postemergent treated plots for all ratings of weeds and wildflowers. It was observed that treated plots did affect the growth of the wildflowers compared to the untreated check; especially cosmos, which had a noticeable increase in stem diameter and axillary branching near the base of the stem. A germination test was conducted indoors and all wildflower species germinated; however, rocket larkspur did not germinate in any field plots, including the check. All other species were present within the untreated and postemergent treated plots and these same species, except sweet alyssum, were present within the preemergent treated plots. Weed species present at the end of the study were identical to the initial species. A preemergent treatment at either application rate provided a significant decrease in the amount of weeds and provided comparable amounts of wildflowers to the untreated check. Sweet alyssum does not appear to be tolerant to a preemergent treatment so species must be carefully selected when seeding. Postemergent applied treatments showed no improvement of weed control compared to the check and temporarily thinned the wildflowers." |
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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):
Spackman, C. W., J. M. Johnson, and L. J. Kuhns. 1997. Evaluation of imazameth for weed control in wildflower establishment. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 51:p. 126-127. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1997_vol51.pdf#page=126
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 51 |
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