The aim of this study was regression and discriminative analysis of effect of Farmer Field School (FFS) approach for the adoption of biological control of rice pests in Sari Township, Iran. The research population consisted of 72 farmers who participated in FFS and 346 farmers who had not participated in FFS, which were selected using randomized sampling method. The methodological approach of this study was descriptive-correlative. Validity of the instrument was established using a panel of experts consisting of senior faculty members in agricultural extension and education department. Furthermore, the agricultural officer of Mazandaran Province validated the questionnaire. Pilot test and reliability analysis was conducted and Cronbach’s alpha was 0.82. The results of the multiple regression analysis (stepwise method) revealed that the variables of knowledge of biological control, comparative advantage of innovations of biological control, mechanization level, rice farming experience, social participation, the number of contacts with extension agent, the extent to which farmers used mass media and information sources described a variation of 75.9% of the adoption of biological control by rice farmers who had participated in FFS. Also the results of the multiple regression analysis (stepwise method) revealed that the variable of knowledge of biological control described a variation of 83.1% of the adoption of biological control by rice farmers who had not participated in FFS. The results of discriminative analysis revealed that 95.8% of the responders (rice farmers) were properly classified based on the discriminative functions.
