GREAT BEND TRIBUNE Late winter kochia control in fields going to soybeans, sunflowers, and wheat Stacy Campbell This is the third and final article in a series discussing pre-emergence herbicides for kochia control. This article will discuss recommendations specific to fields that will be planted to soybean or sunflower this spring and wheat in the fall. Previous articles have discussed general considerations for late-winter kochia control (https://bit.ly/2MWvSrD - Issue 837) and pre-emergence herbicides for kochia control in fields that will be planted to corn or grain sorghum (https://bit.ly/3tKKZp3 - Issue 838). Fields going to soybeans - start in February or early March with a tank-mix of glyphosate (using a minimum of 0.75 lb. ae/acre) or Gramoxone SL (minimum of 2 pts/acre) and 8 to 16 oz./acre of Clarity prior to kochia emergence. The use of Clarity requires a minimum accumulation of 1 inch of rain and then 28 days prior to planting soybeans, except in case of Roundup Ready 2 Xtend or XtendFlex soybeans. As indicated by the label, Clarity cannot be used as a pre-plant treatment in soybeans in areas with less than 25 inches of annual rainfall. Paraquat tank-mixed with metribuzin (Dimetric, others) will provide extended residual control of kochia, as long as the population of kochia is susceptible to triazine herbicides. Be aware of rate restrictions for metribuzin in western KS, as soil and environmental characteristics influence the potential for soybean injury following metribuzin.