Using the agar diffusion method and spread plate method,the inhibitory effects of the gallnut extract on common pathogenic bacteria were observed.The effects of illumination time,temperature and pH value of the gallnut extract on the antibacterial activity were also analyzed.The experimental results showed that the antibacterial effect of the gallnut extract on Gram positive bacteria was stronger than that of Gram negative bacteria.We found that the effects of illumination time,temperature and pH value of t...