A method for Controlling a fitoenfermedad,It comprises a step of implementation of each effective amount of pyridazine hydrochloride Compound represented by the formula (1) and the carboxamide Compound represented by the formula (2) to a plantOr soil to cultivate The Plant, the composition and control method with excellent efficacies against Phyto diseases.Claim 1: a composition for Controlling a fitoenfermedad pyridazine hydrochloride which comprises a compound represented by the formula (1) wherein X represents a Fluorine Atom orA Hydrogen Atom and a carboxamide Compound represented by the formula (2).Claim 4, a method for Controlling a fitoenfermedad,Characterized in that it comprises a step of implementation of each effective amount of pyridazine hydrochloride Compound represented by formula (1) wherein X represents a Fluorine Atom or a hydrogen Atom\u00f3geno and a carboxamide Compound represented by the formula (2) a plant or soil to cultivate The Plant.Claim 6: a combined use of pyridazine hydrochloride Compound represented by the formula (1) wherein X represents a Fluorine Atom or a hydrogen Atom and a compound of carboxamIda represented by the formula (2).Un método para controlar una fitoenfermedad, que comprende una etapa de aplicación de cada cantidad efectiva del compuesto de piridazina representado por la fórmula (1) y el compuesto de carboxamida representado por la fórmula (2) 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 piridazina representado por la fórmula (1) en donde X representa un átomo de flúor o un átomo de hidrógeno y un compuesto de carboxamida representado por la fórmula (2). Reivindicación 4: Un método para controlar una fitoenfermedad, caracterizado porque comprende una etapa de aplicación de cada cantidad efectiva del compuesto de piridazin
