Sugarbeet and Rotational Crop Tolerance from Ethofumesate 4SC Applied Postemergence

摘要

Ethofumesate 4SC was approved in 2017 for postemergence application at rates up to 4.2 kg a.i. ha-1 on sugarbeet with more than two true leaves until 45 days before harvest. Ethofumesate 4SC postemergence at greater rates in mixtures with glyphosate may improve burndown control and increase soil residual control in sugarbeet of broadleaf weeds including waterhemp. Experiments were conducted in 2017,2018, and 2019 in Michigan, Minnesota, and North Dakota, to determine sugarbeet crop tolerance and evaluate ethofumesate fate and persistence when application was timed to calendar dates representing 9-, 10-, and 11-month intervals between sugarbeet and crops commonly planted in sugarbeet rotations. Sugarbeet growth, root yield, sucrose content, and recoverable sucrose were not affected by ethofumesate rate or timing of ethofumesate application. Neither stand density, stature development, flowering date, and plant height nor grain yield, test weight, and moisture percentage of grain at physiological maturity of com, dry bean, soybean, or wheat were affected by ethofumesate soil residues.