Puebla is a biodiverse state located in the central part of México, characterized by having broad heterogeneity of altitudes with extensive diversity in climates and types of vegetation, with predominance of conifer and red oak forests. During 2011, defoliations were detected in different pine species in the Sierra Norte region of Puebla, so that the characteristics presented by the sites affected by the pine litter fall were defined with the purpose of contributing to decision making in management plans. Likewise, the climate conditions of the sites affected from 2011 to 2014 were characterized, finding that the sites facing south, with slopes of between 24 % and 87 %, altitudinal distribution between 1969 and 2835 m, were the ones with greatest affectation, finding Pinus pseudostrobus as the species with highest litter fall.Puebla es un estado biodiverso ubicado en la parte central de México, se caracteriza por tener una amplia heterogeneidad de altitudes con extensa diversidad de climas y tipos de vegetación, predominando los bosques de coníferas y encino. Durante 2011 se detectaron defoliaciones en diferentes especies de pino en la región de la Sierra Norte de Puebla, por lo que se determinaron las características que presentan los sitios afectados por la caída foliar del pino con la finalidad de contribuir a la toma de decisiones en los planes de manejo. Asimismo, se caracterizaron las condiciones climáticas de los sitios afectados del 2011 al 2014, determinando que los sitios con exposición al sur, con pendientes de entre 24% y 87%, distribución altitudinal entre 1969 y 2835 m fueron los de mayor afectación, registrando a Pinus pseudostrobus con la de mayor caída de hojas
