The preemergence herbicide treatment often used on hea vier soils in Michigan is a pyrazon plus TeA at 4.5 kg + 6.7 kg/ha (4 lb + 6 Ib/A). In a favorable environment, good control of many broadleaf and grass weeds is obtained. However, frequently an application of a postemergence herbicide such as phenmedipham is needed to con­ trol many of the escaped broadleafweeds or some grasses (1, 3, 4, 5)3 Redroot pigweed is an annual broadleaf weed that phenmediphaLl will not control. EP-475, an analog of phenmedipham, is effective on pigweed (10).