Picolinic acid derivative, and herbicidal composition

摘要

The present invention is to provide a novel picolinic acid derivative having the formula, <IMAGE> (wherein R is a hydrogen atom, an alkyl group or others, R1 and R2 are the same or different, and are an alkyl group, an alkoxy group or others, X is a cyano group, a phenoxy group or others, Y is an oxygen atom or others, and n is 0 or 1) or a salt thereof; a method for preparing the same; and a herbicidal composition containing the same as an active ingredient. The picolinic acid derivative or the salt thereof of the present invention achieves an excellent herbicidal effect at a low dosage, and is effective for controlling the growth of various weeds in a wide range. The picolinic acid derivative or the salt thereof of the present invention can be applied to a paddy field, a cultivated field, a non-agricultural land and the like as a herbicidal composition.