| multiple resistance of acetolactate synthase and protoporphyrinogen oxidase inhibitors in euphorbia heterophylla biotypes. | resistance to acetolactate synthase (als)-inhibiting herbicides in brazil has been documented for six species. the probability to select biotypes of euphorbia heterophylla (epphl) with multiple resistance increases in the same order of magnitude as the use of other herbicides belonging to only one mechanism of action. the objectives of this work were to evaluate the distribution of resistant populations (r) in the states of the parana and santa catarina; to determine the existence of populations ... | 2005 | 15656167 |