Effect of Acifluorfen and Lactofen Application Timing on Peanut Injury and Yield
2011
Boyer, J. A. | Ferrell, J. | MacDonald, G. | Tillman, B. | Rowland, D.
More emphasis is being placed on protoporphyrinogen oxidase (PPO)-inhibiting herbicides such as acifluorfen and lactofen for the control of acetolactate synthase (ALS)-resistant weeds. The objective of this research was to determine the visual injury, canopy development, and yield losses from these herbicides applied to peanuts post-emergence. Herbicides were applied to three peanut cultivars, in a split-plot arrangement, at 4, 6, 8, or 10 weeks after planting. Visual injury and canopy closure were similar for all cultivars and both herbicides. Visual injury at 7 days after treatment (DAT) was greatest (46 to 48%) for the 4 weeks after planting (WAP) herbicide timing. Injury ratings of to 20 to 27% were observed when applications were delayed until 10 WAP. Injury decreased to 5% or less by 28 DAT for all application timings. Canopy closure was delayed by the 4 and 6 WAP timings in 2007 and the 4, 6, and 8 WAP timings in 2008. Crop yields were similar in all cultivars. However, yield interactions were occurred between year, herbicide, and application timing. Lactofen reduced yields when applied at 8 WAP for both years while acifluorfen and lactofen reduced yields when applied at 10 WAP in 2008. These data indicate that late-season applications have a greater potential to reduce yield than when applied early.
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