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Banvel for Fall Control of Field Bindweed
Dicamba (Banvel/Clarity) is a more expensive but more effective herbicide compared to 2,4-D for fall control of field bindweed. Research has shown that fall applied dicamba at 1 to 2 pounds/acre (1 to 2 quarts/acre of Banvel/Clarity) gave 87 to 97 percent control of field bindweed. Dicamba can be applied after frost, provided the stems have not been killed by the freezing temperatures. Dicamba residue in the soil can injure sensitive broadleaf crops planted the following spring. Only wheat, corn, or sorghum can be planted the following growing season. However, even these crops can be injured when dicamba at 2 pounds per acre or more is applied in the fall. Therefore, dicamba at high rates should only be used for spot treatment of field bindweed patches. To minimize risk of crop injury, use low rates of dicamba plus 2,4-D in the fall, which will give good control after two to three years of repeated annual fall treatments. The recommended interval between dicamba application and planting wheat, corn, or sorghum is 45 days per pint of product used, not including days when ground is frozen.
For more information consult NDSU Extension Circular W-802 at http://www.ext.nodak.edu/extpubs/plantsci/weeds/w802w.htm
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