Studies on the mode of action of diflufenican in selected crop and weed species: Basis of selectivity of pre‐ and early post‐emergence 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 [14C]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.