Abstract: In this study,pure Penicillium italicum Wehmer and P.digitatum Sacc were obtained by multi-separation and purification with potato-dextrose agar(PDA) . The two strains were respectively inculated and cultivate into the PDA added with different amounts of chitosan to investigate the bacteriostatic effects of chitosan. The results showed that chitosan has some inhibitory effects against the two strains,especially stronger effect against Penicillium italicum Wehmer. The highest bacteriostatic rate is achieved at the chitosan concentration of 1.3%,and the bacteriostatic rates against the two strains reach 71.5% and 46.37% on the second day,respectively.

Key words: chitosan, Penicillium italicum Wehmer, P.digitatum Sacc, bacteriostatic rates