These herbicides are labeled for ditch banks and will not harm fish at normal rates. Rate of application is 2 gallons per acre for young patches and 3 gallons per acre if the patch is over 10 years old. Do not spray the chemical into the water. This will not harm most hardwoods, but damage will occur on cottonwoods, elms, and any legumes such as redbud or locusts. Application Technique Application technique is critical in kudzu control due to the layering of growth and the multiangle orientation of the foliage.
Thorough coverage is essential to good control.
Open patches should be treated with a cross-hatch spray pattern. First, the outside perimeter of the spray area is treated and the area covered by spraying parallel swaths. Half of the total solution should be used for this coverage. The remaining half of the mixture should be applied in spray swaths perpendicular to the initial coverage. Total volume of spray mixture varies between applicators, but 40-80 gallons per acre is a consistent recommendation.