According to the present invention, grass grass and perennial weed control agents exhibiting a high controlling effect against rice and perennial weeds, which are difficult to control with conventional grass herbicides, and which exhibit a quick control effect, are provided. The present invention relates to a method for controlling perennial weeds in grasses and rice paddies, comprising the step of administering a controlling agent containing 1,5-diphenyl-1H-1,2,4-triazole-3-carboxylic acid amide derivatives represented by a specific structure as an active ingredient , Paddy and perennial weeds applied to grass by soil treatment or foliar application.
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