This technical note describes the results of a field demonstration to examine the effectiveness of combining endothall applied as Aquathol(registered) K with other aquatic herbicides for control of hydrilla. Concentrations and combinations were based on previous greenhouse trials conducted at the Lewisville Aquatic Ecosystem Research Facility (LAERF) in Lewisville, Texas, using Aquathol(registered) K, Reward(registered) (diquat), Hydrothol(registered) 191 (endothall) and Cutrine(registered)-Plus (chelated copper). The use of herbicide combinations is a widespread ...