ProCrop

Roundup Ultra Combination for Field Bindweed Control 

Glyphosate (Roundup, Touchdown, or equivalent) is a non-selective herbicide with no soil activity. Any labeled crop can be planted after fall or spring glyphosate application. Glyphosate should be applied when plants are actively growing and are at or beyond full bloom. Poor control will result if plants are under stress, not actively growing, or covered with dust. Glyphosate should be applied at 3 to 3.75 pounds per acre (4 to 5 quarts per acre of a 3 pound acid equivalent per gallon formulation) and in the least amount of water recommended on the label. However, refer to label for rate when used in a glyphosate resistant crop or for use in conventional crops as a crop desiccant or spot treatment. Several formulations of glyphosate are available. so refer to the label for correct surfactant to use. Always add ammonium sulfate at 2 percent by weight or 17 pounds per 100 gallons of water for increased control. Many areas in North Dakota have water high in sodium bicarbonate, calcium or other salts that reduce the effectiveness of glyphosate. Ammonium sulfate can help overcome antagonistic effects of salts in the spray carrier water and enhance herbicide control in water without salts.

Table 1. Field bindweed control from summer or fallow applications of dicamba. Visual estimates of control were made 10 to 16 months after treatment.

A tank mix of dicamba at 0.5 pound per acre (1 pint per acre Banvel/Clarity) plus glyphosate at 1.5 pounds per acre (2 quarts per acre of a 3 pound acid equivalent per gallon formulation) gives better and more consistent control of field bindweed than glyphosate applied alone (Table 1). This treatment has less potential for soil carryover of dicamba than using higher dicamba rates of 1 to 2 pounds per acre.

Landmaster BW is a premix of glyphosate and 2,4-D and should be applied at 54 fluid ounces of product per acre (0.38 pounds per acre of glyphosate plus 0.68 pounds per acre of 2,4-D). Application should be made when vines are 6 to 18 inches long. This treatment is more cost-effective than other treatments commonly used for field bindweed control. Addition of ammonium sulfate at 17 pounds per 100 gallons of water may improve herbicide performance under some situations. Research has shown improved field bindweed control when picloram (Tordon) at 0.06 to 0.12 pounds per acre (1 to 2 fluid ounces) was added to Landmaster BW. Allow 7 days after Landmaster BW application before tillage is performed.

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