Published online by Cambridge University Press: 12 June 2017
The possible use of the phenoxybutyric acids as selective herbicides in the pea crop has been recognized from the beginning of their development (3) and preliminary experiments with the more important compounds of this series carried out in 1954 indicated that 4–(2–methyl–4–chlorophenoxy)butyric acid [4–(MCPB) showed the most promise (1). To date no results have been reported on the persistence of MCPB in peas; experiments were, therefore, undertaken to determine this under field conditions.