This study aimed mainly at identifying the knowledge and implementation gap of potato farmers towards good practices to control brown rot disease and the degree of their tendency towards exporting in the countryside of Behiera Governorate. Simple random sample was 220 respondents. The results showed that there was a knowledge gap among farmers estimated at 33% in the field of potato brown rot control, and an implementation gap estimated at 48%. There is high percentage of the low and neutral attitude towards export was 74.5%. It was found that only three independent variables contributed significantly to explaining the total variance in the occurrence of the knowledge gap of the respondents. Also, only three independent variables contributed significantly to explaining the total variation in the occurrence of the implementation gap for the respondents. While only two independent variables contributed significantly to explaining the total variation in the attitude towards export. Recommendations: It is necessary to plan and implement extension programs to provide farmers with the necessary experience and sound practices to prevent and control brown rot disease, as it was revealed that a knowledge and implementation gap has emerged in farmers' practices in the field of controlling potato brown rot.