Pear (P. bretschneideri Rehd.) fruits at commercial maturity were bought from local market in Xiasha district, Hang Zhou,China. After disinfection by 2% sodium hypochlorite, the fruits were wounded at the equator using the tip of a sterile dissecting needle and inoculated with 10 L P. expansum spore suspension at1.0 × 104 spores/mL. Before inoculation, spores were cultured shak-ily in PDB containing 0 or 0.6% NaHCO3 for 6 h at 25◦C. The decay incidence and lesion diameter of all fruits were recorded after storage for 3 to 8 days. There were 15 fruits in each treatment with three replicates and the experiment was repeated.