Full TGIF Record # 43085
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):McKemie, T. E.; Burton, J. D.; Monks, D. W.; Weber, J. B.
Author Affiliation:Department of Horticultural Science and Department of Soil Science, North Carolina State University, Raleigh, N.C. 27695
Title:Control of large crabgrass (Digitaria sanguinalis) with selective grass herbicides applied preemergence
Section:Papers and Abstracts Presented
Other records with the "Papers and Abstracts Presented" Section
Meeting Info.:49th Annual Meeting, Charlotte, NC, January 15-17, 1996
Source:Southern Weed Science Society Proceedings. Vol. 49, 1996, p. 182.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Abstract/Contents:"Field experiments were conducted on two sites at BASF's Field Test Site located in Wilbon, NC in 1992, 1993, and 1994 to determine the response of large crabgrass [Digitaria sanguinalis L.] to quizalofop-p-ethyl and sethoxydim applied preemergence (PRE) at 0.08, 0.07, 0.06, 0.05, and 0.04 kg ai/ha and 0.5, 0.4, 0.3, 0.2, and 0.1 kg ai/ha, respectively. Treatments were applied to a sandy clay loam and a sandy loam soil. Soils at each location were similar as described by soil taxonomy, but differed in their surface texture, OM content, clay content, and particle size. The relative phytotoxicity of quizalofop-p-ethyl to large crabgrass varied greatly over the three year period, ranging from 66 to 94% (overall mean = 82%) on the sandy loam and from 73 to 90% (overall mean + 80%) on the sandy clay loam. In the sandy loam soil, 80% control of large crabgrass was achieved with 0.06 kg ai/ha, while it took 0.07 kg ai/ha to achieve this level of control in the sandy clay loam. Under the dryer conditions of 1993, 0.07 kg ai/ha was necessary to reduce large crabgrass populations in the sandy loam. In the sandy clay loam there were no significant differences observed between treatments in 1993. The rate of quizalofop-p-ethyl needed to maintain 80% large crabgrass control in the sandy loam and in the sandy clay loam was 0.07 to 0.08 kg ai/ha in all three years of testing. In 1992 and 1994, large crabgrass control with sethoxydim was similar in the sandly loam soil but, did not reach 80% large crabgrass control in the sandy loam and in the sandy clay loam was 0.07 to 0.08 kg ai/ha in all three years of testing. In 1992 and 1994, large crabgrass control with sethoxydim was similar in the sandy loam soil but did not reach 80% control. In the sandy clay loam soil, sethoxydim did not control large crabgrass at any of the rates tested over the same period. In 1993, sethoxydim provided 84% control of large crabgrass at 0.2 kg ai/ha in the sandy loam soil and 76 to 94% at 0.4 to 0.5 kg ai/ha in the sandy clay loam. Large crabgrass control with sethoxydim was unacceptable in 1992 and 1994 in the sandy loam and sandy clay soil. In 1993, sethoxydim provided approximately 80% control of large crabgrass applied at 0.4 kg ai/ha to the sandy loam and 70% control in the sandy clay loam at 05. kg ai/ha. The significant year interactions for field studies can be partially explained by weather before and after applications. While temperature and humidity were within normal ranges for all three years, rainfall was quite variable. In 1992, rainfall amounts were higher on the experimental area than in 1993 and 1994. In 1993, all the water received by the treated area was from irrigation. In 1994, fewer rainfall events occurred and less irrigation was needed to prevent plants from wilting. Significant interactions attributable to soil type may be explained by the different amounts of reactive colloids present or differences in the water holding capacities of these soils. Soil with higher OM or clay content would be more sorptive for the herbicides and would have higher water holding capacities. Higher sorptivity would reduce the concentration of the herbicide available to the emerging weed, but higher water holding capacity would also have the ultimate effect of diluting the available herbicide concentration."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McKemie, T. E., J. D. Burton, D. W. Monks, and J. B. Weber. 1996. Control of large crabgrass (Digitaria sanguinalis) with selective grass herbicides applied preemergence. South. Weed Sci. Soc. Proc. 49:p. 182.
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