Herbicide tests for kudzu eradication.
Trials with 15 herbicides were conducted for 2 yr at 6 sites invaded by kudzu [Pueraria lobata] on the Piedmont and Upper Coastal Plain of Georgia and Alabama. The most cost-effective treatment was Tordon 101 Mixture (picloram + 2,4-D) applied at 2 gal/acre. Tordon 10K pellets (picloram) were slightly more effective but cost 3 times more than Tordon 101. Both herbicides reduced kudzu coverage to ≤1%. Spike 40P (an experimental tebuthiuron pelleted formulation) reduced coverage to 0.4%. All treatments were less effective as kudzu patch age and soil stoniness increased. Kudzu draped on pine trees was controlled by a 1% solution of Garlon 4 (triclopyr ester) in diesel oil applied in early spring before vine foliage developed. Tordon 101 Mixture and Banvel 720 (dicamba + 2,4-D) sprayed at 1 gal/acre did not cause mortality of 35-ft pines. Retreatments will be necessary to eradicate kudzu invading pine stands of this size.