The infestation of potato tubers by the soft rot bacteria were detec-ted by the direct isolation method,enrichment technique followed byisolation,the moist chamber technique and anaerobic wrapping technique.Results of comparison showed that (?)naerobic wrapping technique was themost effective method.Among 46 samples of potato tubers collected from23 provinces of China percentage of tubers infested ran from 0~100 per-cent.Total 284 isolates of Erwinia were isolated from 33 samples ofpotato tubers.of cohich 7...