In the reaearch, it cultures the Dothiorella gregaria Sacc. with Potato Dextrose Agar Medium in the lab, dealing medium with the same amount-of-substance concentration of NaHCO_3, Na2CO_3 and KHCO_3. Besides, in the research it adjusts the pH value with NaOH to test the inhibiting effect of the different chemical. Meanwhile it tests the control effect on the poplar blister canker disease of the NaHCO_3 in the general field condition to study the mechanism of action on the control of poplar canker disease wi...