The invention belongs to a herbicide for preventing and weeding
dicotyledon weeds and barnyard grasses in paddy fields, relating to a mixed herbicide which has the effective
active components of carfentrazone-ethyl, pyrazosulfuron-ethyl and
quinclorac. The mixed herbicide comprises the effective
active components, moist additive, filler and the like, and is characterized in that the effective
active components are the carfentrazone-ethyl, the pyrazosulfuron-ethyl, the
quinclorac, preparations with different contents thereof and various dosage forms, wherein the carfentrazone-ethyl, the pyrazosulfuron-ethyl and the
quinclorac have the ratio by weight of 1:(1-2.5):(15-40). The invention has the advantages that after being mixed, the carfentrazone-ethyl, the pyrazosulfuron-ethyl and the quinclorac have obvious effects of synergism and enhancing
weed control speed, obtains
control effect to various broadleaf weeds and the barnyard grasses in the paddy fields, has
low toxicity and low residual, expands the
weed control spectrum, greatly lowers the
drug dosage, the
pesticide application frequency and the
drug cost, and is beneficial to retarding the succession velocity of
weed populations and prolonging the service life of the herbicide.