PERTANIKA JOURNAL OF TROPICAL AGRICULTURAL SCIENCE

A recently synthesized herbicide Aquathol K was tested on the water weed Hydrilla verticillata. Results from the laboraoty tests indicated that Aquathol K with concentrations ranging from 1.0 mg/1 to 2.0 mg/1 can kill this weed. Evidently, 100% injury was achieved within 10 days for the plants treated with the highest concentration. 2.0 mg/1 of Aquathol K. The rate of 100% injury was recorded much slower with 1.0 mg/1. With lower concentration 0.5'mg/1 and 0.1 mg/1, 100% injury was never achieved within 25 days. Therefore, the herbicide was not very effective at lower concentrations.