Mark VanGessel, Extension Weed Specialist; mjv@udel.edu
Weed control options remain limited for processing peas. Pursuit can be used as a pre-plant incorporated or preemergence treatment and is used primarily for broadleaf weeds. Preemergence applications of Command or Dual are labeled for control of annual grasses and some broadleaf weeds. Crop safety with these herbicides improve as the air and soil temperatures increase.
Be aware that if you intend to plant lima beans after peas, Command cannot be used in peas. The Command label states a 9-month rotation between application and planting lima beans
For postemergence applications, Basagran and Thistrol are labeled for broadleaf weeds. Apply Basagran after peas have more than three pairs of leaves. Do not add oil concentrate. Select, Assure II, Targa, or Poast can be used for postemergence grass control.
For no-till plantings of early peas, controlling all weeds present before planting can be challenging. The cool weather can result in poor performance with glyphosate. There are no products that can be tankmixed with glyphosate to improve control in this situation. In some situations, use of glyphosate 10 to 14 days prior to planting and then a sequential application of Gramoxone maybe need at planting to completely kill weeds prior to planting.