Developing physical property-based rules which govern the greenhouse activity of herbicidal 2-aryl-1,2,4-triazole-5(1H)-thiones

The understanding of physical properties which significantly influence greenhouse efficacy of a series of soil-applied pre-emergent herbicides is discussed. The compounds, 4-aryl-1,2,4-triazole-5(1H)-thiones, display broad spectrum control of grass weeds. Eighty-five percent control is achieved for several species at greenhouse rates as low as 33 g/ha. Favorable selectivity toward corn, wheat, and rice was observed in greenhouse testing. The greenhouse and field efficacy and weed spectrum are reviewed