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Field Bindweed Control in Growing Crop
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 not volatile and can drift both as a particle and as a 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 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 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.
Corn
Field bindweed growing in corn can be suppressed with dicamba (Banvel/Clarity) or 2,4-D amine. Dicamba at 0.25 pound per acre (0.5 pint per acre Banvel/Clarity) may be applied until corn is 36 inches tall or until 15 days before tassel emergence, whichever comes first. Drop nozzles should be used after corn is 8 inches tall to reduce dicamba drift and risk of corn injury. Dicamba should not be used if susceptible crops are growing nearby. Corn 3 to 8 inches tall may be treated with 2,4-D amine at 0.5 pound per acre (1 pint of a 4 pound per gallon formulation). When corn is more than 8 inches tall, drop nozzles should be used when applying 2,4-D to reduce crop injury by keeping the herbicide off of the upper leaves and whorl.
Soybean and Sunflower
Herbicides are not available to selectively control field bindweed in soybean or sunflower. Glyphosate at 3 to 3.75 pounds per acre (4 to 5 quart per acre Roundup or equivalent) may be used for spot treatment of field bindweed in soybean, but the crop in the treated area will be killed. Timely cultivation may partially control field bindweed in soybeans or sunflowers
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