FMC Corporation has recently received a label for a new soybean herbicide, Command Xtra. Command Xtra is a co-pak of a broadleaf (Command Xtra B) and a grass herbicide (Command Xtra G). The broadleaf component is sulfentrazone at 4 pounds per gallon, and the grass component is the encapsulated formulation of clomazone at 3 pounds per gallon. Command Xtra can be surface applied in all tillage systems from 30 days prior to planting to before soybean emergence. Depending on soil type, recommended rates range from 8 to 12 fluid ounces per acre of Command Xtra B and from 21.3 to 32.0 fluid ounces per acre of Command Xtra G. For example, the recommended rate for a medium-textured soil would be 9.6 fluid ounces per acre of Command Xtra B and 25.6 fluid ounces per acre of Command Xtra G, which would be equivalent to 6.4 ounces per acre of Authority 75WDG and 1.6 pints per acre of Command 3ME. This new herbicide will control a number of annual broadleaf and grass weed species including kochia, lambsquarters, morningglory, nightshade, pigweed, velvetleaf, barnyardgrass, crabgrass, and green and giant foxtail. |
Because Command Xtra contains higher rates of sulfentrazone than are currently used, it may help increase and provide longer control of waterhemp and eastern black nightshade. However, there are certain soybean varieties that are more sensitive to sulfentrazone, and these higher rates may also cause soybean injury. A number of seed companies currently publish herbicide-sensitivity guides on the sensitivity of different soybean varieties to a number of herbicides. It may be useful to consult these sensitivity ratings to sulfentrazone when deciding to use this herbicide. Another precaution that needs to be taken when using this herbicide is to avoid drift. The clomazone component of this co-pak has been shown to cause whitening of sensitive plants when drifted on. The label specifically states not to apply this herbicide within 1,200 feet of towns, housing developments, commercial fruit and vegetable production, greenhouses, and nurseries. Avoid applications within 300 feet of desirable plants and do not apply in winds more than 10 miles per hour. Also, this herbicide should not be applied to sands with less than 1% organic matter.
Command Xtra may only be applied once per season, and soybeans may be replanted anytime after application. However, there is a 10-month rotational restriction for the planting of field corn and sorghum, and a 12-month rotational restriction for wheat. When extreme dryness occurs within the 4 months following application, additional risk to rotational crops can occur. Consult the label for additional rotational restrictions.--Christy Sprague and Aaron Hager