Abstract:To determine the main pathogens of Prunus salicina after harvest and explore the inhibitory effect of methyl jasmonate on its postharvest storage disease，the pathogens were isolated and purified from the diseased fruit of P.salicina during storage.The pathogens were identified by pathogenicity detection，morphological identification，and rDNA-ITS sequence analysis.In vitro experiments were carried out to study the inhibitory effect of different concentrations of methyl jasmonate （0，0.1，0.2，0.3，0.4 mmol/L，and 0.5 mmol/L）on the main pathogens of P.salicina and measure the indoor virulence.The results showed that the main pathogens causing postharvest decay of P.salicina were Botrytis cinerea and Alternaria alternate.In vitro experiments showed that different concentrations of methyl jasmonate inhibited the mycelial growth of the two strains of pathogens，among which 0.4 mmol/L and 0.5 mmol/L methyl jasmonate effectively inhibited the growth of pathogens of P.salicina after harvest，but there had no significant difference in their inhibitory effects on the pathogens（P>0.05）.The inhibition rates of 0.4 mmol/L methyl jasmonate on Botrytis cinerea and Alternaria alternata were 89.3%and 86.3%，respectively，on the 5thday of in vitro cultivation.The EC50of methyl jasmonate on Botrytis cinerea and Alternaria alternata were 0.154 mmol/L and 0.228 mmol/L，respectively，on the 2nd day of in vitro cultivation，and were 0.193 mmol/L and 0.348 mmol/L on the 5th day of in vitro cultivation.It is concluded that the appropriate concentration of methyl jasmonate can effectively inhibit the growth of pathogens in P.salicina during storage，which can be used in the postharvest disease control and the storage and preservation of P.salicina in the later stage.