Picolinic acid derivative, production thereof, and herbicide

摘要: A novel picolinic acid represented by general formula (1) and its salt, a process for producing the same, herbicide containing same as active ingredient, wherein R represents hydrogen, alkyl, etc.; R?1 R2? may be or different from each other cyano, phenoxy, Y oxygen, sulfur, n 0 1. The derivative salt have an excellent herbicidal effect on wide variety of weeds even in small doses, so that they are applicable to lowland upland fields, non-crop land, forth.