Article contents
Duration of yellow nutsedge (Cyperus esculentus) competitiveness after herbicide treatment
Published online by Cambridge University Press: 20 January 2017
Abstract
Experiments were initiated to determine the amount of time required for postemergence herbicides to render yellow nutsedge physiologically noncompetitive. The rate of net CO2 assimilation (A N) was chosen as the response variable to describe competitiveness. Specifically, the time required after herbicide treatment for A N to drop to 50% of that of the untreated control (A N50) was determined. A N50 values for halosulfuron, imazapic, glyphosate, and MSMA were 1.6, 2.1, 3.2, and 3.3 d, respectively. An A N50 value was not calculated for bentazon because A N rapidly decreased below 50% but recovered to > 50% by 9 d after treatment (DAT). Stomatal conductance to water vapor (g s) declined similarly with A N over time for halosulfuron, imazapic, and glyphosate treatments. However, g s of MSMA-treated plants was near 95% of the untreated control, whereas A N declined to 35% 11 DAT. At 11 DAT, all aboveground biomass was removed, and plants were returned to the greenhouse, and regrowth was determined after an additional 14 d. Yellow nutsedge regrowth for halosulfuron, imazapic, glyphosate, and MSMA was below 5% of the untreated control and was not statistically different. However, regrowth from bentazon was 44% of the control. Therefore, bentazon was the least effective herbicide tested, whereas halosulfuron and imazapic were most effective for yellow nutsedge control.
Keywords
- Type
- Physiology, Chemistry, and Biochemistry
- Information
- Copyright
- Copyright © Weed Science Society of America
References
Literature Cited
- 12
- Cited by