A method for controlling a phyto-disease comprising a step of applying each effective amount of the tetrazolinone compound and the carboxamide compound to a plant or soil to cultivate the plant, the composition and method with excellent phyto-disease control efficiencies. Claim 1: A composition for controlling a phyto-disease characterized in that it comprises a tetrazolinone compound represented by the formula (1) wherein X¹ represents a halogen atom, a C₁₋₆ alkyl group or a C₁₋₆ alkoxy group,X2 represents a c832131 rent group；a C₃₋₄ cycloalkyl group,a halogen atom or a C₁₋₃ alkoxy group,and a carboxamide compound represented by the formula (2). Claim 7: A method of controlling a phyto-disease, comprising a step of applying each effective amount of a tetrazolinone compound represented by the formula (1) characterized in that X¹ represents a halogen atom, a C₁₋₆ alkyl group or a group C₁₋₆ alkoxy,X2 represents a c832131 rent group；a C₃₋₄ cycloalkyl group,a halogen atom or a C₁₋₃ alkoxy group,and a carboxamide compound represented by the formula (2) to a plant or soil to grow the plant. Claim 9: A combined use of a tetrazolinone compound represented by the formula (1) characterized in that X¹ represents a halogen atom, a C₁₋₆ alkyl group or a C₁₋₆ alkoxy group,X2 represents a c832131 rent group；a C₃₋₄ cycloalkyl group,a halogen atom or a C₁₋₃ alkoxy group,And a carbohydrate represented by formula (2).Un método para controlar una fitoenfermedad que comprende una etapa de aplicación de cada cantidad efectiva del compuesto de tetrazolinona y el compuesto de carboxamida a una planta o suelo para cultivar la planta, la composición y método con excelentes eficacias de control contra fitoenfermedades. Reivindicación 1: Una composición para controlar una fitoenfermedad caracterizada porque comprende un compuesto de tetrazolinona representado por la fórmula (1) en donde X¹ representa un átomo de halógeno, un grupo alquilo C₁₋₆ o un grupo alcoxi C₁₋₆, y X² representa un grupo
