Identification of the Pathogen Causing Canker on Juglans sigilltata L. and Indoor Screening of Fungicides

To identify the pathogen causing canker on Juglans sigilltata L. and screen fungicides, the pathogen collected from Dayao County of Yunnan Province was isolated and identified and 8 fungicides were tested in toxicity. By following the Koch's postulate, the pathogen was confirmed and was identified as Botryosphaeria dothidea based on its morphology and rDNA-ITS gene sequence. The toxicities in EC50 were 0.0604, 0.1690, 0.1778, 0.4769, 2.0947, 3.961 0, 4.2190 and 101.7643mg/L for fluazinam, tebuconazole, difenoconazole, azoxystrobin, thiram, thifluzamide, iprodione and cymoxanil, respectively.