The application of pesticide by farmers in Garut is less intensive compared to that in Pangalengan. According to Santoso (1997), spraying interval by farmers in Pangalengan is 2 - 3 days and have been conducted since 1980 (Soeriatmadja and Sastrosiswoyo 1988). The difference in application interval of the insecticide could be the reason why resistance ratio value detected in Garut and Pangalengan district was not the same.