Crop tolerance to herbicides is the most important consideration in selecting the herbicide and rate. Herbicide rate is also influenced by climate, herbicide formulation, method of application, and timing and frequency of treatment. In drier regions, ester formulations of 2,4-D have given more effective weed control than amine formulations. In areas where 2,4-D susceptible crops are grown, the amine formulation of 2,4-D is recommended because amines are less volatile and move primarily as particle drift. Esters are volatile and can drift both as particles and vapor.
Field bindweed can be treated in corn, wheat, barley, or rye with 2,4-D ester or amine at 0.5 pound per acre (1 pint per acre of a 4 pound per gallon formulation) during the tillering stage of the crop. This low rate will suppress field bindweed but will not give long-term control. Greatest control is obtained when herbicide applications are made to field bindweed at the bud stage, but application should correspond to the period of greatest crop tolerance. Fall treatments of 2,4-D at 1 to 2 pounds per acre (1 to 2 quarts of a 4 pound per gallon formulation) should be applied when soil moisture is plentiful and after field bindweed has 12 inches of growth. Herbicides can be applied until a killing frost has occurred.
Dicamba (Banvel/Clarity) is more expensive but more effective compared to 2,4-D for fall control of field bindweed. Research has shown that fall applied dicamba at 1 to 2 pounds per acre (1 to 2 quarts per acre of Banvel/Clarity) gave 87 to 97 percent control of field bindweed (Table 1). 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.
Field bindweed can be treated in corn, wheat, barley, or rye with 2,4-D ester or amine at 0.5 pound per acre (1 pint per acre of a 4 pound per gallon formulation) during the tillering stage of the crop. This low rate will suppress field bindweed but will not give long-term control. Greatest control is obtained when herbicide applications are made to field bindweed at the bud stage, but application should correspond to the period of greatest crop tolerance. Fall treatments of 2,4-D at 1 to 2 pounds per acre (1 to 2 quarts of a 4 pound per gallon formulation) should be applied when soil moisture is plentiful and after field bindweed has 12 inches of growth. Herbicides can be applied until a killing frost has occurred.
Dicamba (Banvel/Clarity) is more expensive but more effective compared to 2,4-D for fall control of field bindweed. Research has shown that fall applied dicamba at 1 to 2 pounds per acre (1 to 2 quarts per acre of Banvel/Clarity) gave 87 to 97 percent control of field bindweed (Table 1). 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.
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