Studies show that only xanthomonas campestri pv. brunneivaginae and Sarocladium oryzae can cause the disease. Inoculation of S. oryzae infects the sheath only on booting stage with the symptoms of sheath rot. Liquid culture of X.campestris pv. brunneivaginae was inoculated into the sheath of WenXian No. 10 after filtration with bacteria filter, tetracin (1000ppm) and chloroform treatment, No disease was found. Wen-Xian No. 10 inoculated with the juice of diseased sheath tissue and phage did not give any disease symptoms. No viruses were observed in pulification liquid and super thin sections o...
