STUDIES ON THE MODE OF ACTION OF DIFLUFENICAN IN SELECTED CROP AND WEED SPECIES - BASIS OF SELECTIVITY OF PREEMERGENCE AND EARLY POSTEMERGENCE APPLICATIONS

Diflufenican, a pre- and early post-emergence herbicide, was found to be highly active against a wide range of weeds at application rates of 50-250 g ha-1. Studies on the mode of selectivity with [C-14]diflufenican have demonstrated that selectivity between cereal crops and selected weed species is primarily due to differential uptake and indirectly to translocation; 'depth protection' appears to be the major reason for selectivity of soil-applied diflufenican.