Rapid determination of herbicide resistance pattern in blackgrass

A rapid reliable seedling test was developed to determine the resistance pa ttern of Alopecurus myosuroides populations through a set of 13 herbicides. It is based on coleoptile length of seedlings exposed to the commercial he rbicide formulation for six days. For each herbicide, the lowest concentrat ion that strongly inhibits the coleoptile growth of a suceptible population was selected using the inhibition curve. Resistant populations were used t o check the accuracy of these concentrations for a reliable screening of re sistance.