PYRIDIN DERIVATE UND HERBIZIDE

A pyridone derivative represented by the general formula: äwherein R is an alkyl group or a haloalkyl group, R is a hydrogen atom, an alkyl group, a haloalkyl group, an acetyl group, an amino group, an alkoxycarbonylamino group, an alkylcarbonylamino group or the like, R is a hydrogen atom, an alkyl group, a carboxyl group or an alkoxycarbonyl group, R is a hydrogen atom, a halogen atom, a cyano group or the like, Q is a phenyl group which may be substituted or a condensed hetero ring which may be substitutedü, a herbicide containing it and an intermediate for its production, are provided. The herbicide of the present invention exhibits excellent herbicidal effects against various weeds which cause trouble in upland fields, for example, broad leaved weeds such as pale smartweed, slender amaranth, common lambsquaters, common chickweed, velvetleaf, prickly sida, hemp sesbania, pitted morningglory and common cocklebur, perennial and annual cyperaceous weeds such as purple nutsedge, yellow nutsedge, Cyperus brevifolius and rice flatsedge, and gramineous weeds such as barnyardgrass, Digitaria ciliaris, green foxtail, annual bluegrass, Johnsongrass, blackgrass and wild oat, over a wide range from the pre-germination to the growing stage. The herbicide of the present invention can further control annual paddy weeds such as barnyardgrass, smallflower umbrellaplant and monochoria and perennial paddy weeds such as Japanese ribbon wapato, arrowhead, flat sedge, water chestnut, bulrush and narrowleaf waterplantain. On the other hand, the herbicide of the present invention is highly safe to crop plants and shows high safety especially to rice, wheat, barley, corn, sorghum, soybean, cotton and sugar beet.