According to the present invention, difficult Gramineae perennial is control in the existing grass herbicide It shows a high controlling effect on weeds, and, expression of control effect is fast, lawn for gramineous perennial weed control agent is provided. A method for controlling grass gramineous perennial weeds of the present invention, control agent containing 1,5-diphenyl -1H-1,2,4- triazole-3-carboxylic acid amide derivative represented by the specific structure as an active ingredient , and comprises applying by soil treatment or foliar treatment on the grass that grows gramineous perennial weeds.
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