Effect of Fall-applied Residual Herbicide Mixtures on Rice Growth and Yield
ORCID
MSU Affiliation
College of Agriculture and Life Sciences; Department of Plant and Soil Sciences; Department of Agricultural Science and Plant Protection; Delta Research and Extension Center
Creation Date
2025-12-11
Abstract
The recommended method of control for glyphosate-resistant (GR) Italian ryegrass in Mississippi is the utilization of fall-applied residual herbicides; however, these treatments may negatively impact rice performance. A field study was conducted at the Mississippi State University Delta Research and Extension Center to evaluate rice performance following fall-applied treatments of residual herbicides plus flumioxazin at different rates. Pooled over with and without flumioxazin and herbicide rates, clomazone and dimethenamid-P caused < 10% injury 28 d after emergence (DAE). Acetochlor delayed rice maturity 2 d when compared to clomazone, dimethenamid-P, and flumioxazin. Rice density was reduced ≥ 4 plants m-2 following fall-applied acetochlor and dimethenamid-P compared to the nontreated. Rough rice yields were reduced ≥ 670 kg ha-1 with fall-applied acetochlor alone and dimethenamid-P compared to the nontreated. Acetochlor should not be utilized as a fall-applied treatment in areas scheduled for growing rice the following season. Given current label restrictions and rice injury caused by acetochlor and dimethenamid-P, clomazone remains the only viable option for controlling GR Italian ryegrass where rice is scheduled to be planted the following spring.
Publication Date
11-26-2025
Publication Title
Weed Technology
Publisher
Cambridge University Press
First Page
1
Last Page
17
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Eubank, T. W., Burrell, T. D., Bond, J. A., & Allen, T. W. (2025). Effect of fall-applied residual herbicide mixtures on rice growth and yield. Weed Technology, 1–17. doi:10.1017/wet.2025.10069
