In vitro effect of methanol extract on mycelial growth of B. cinerea
and P. capsici. The concentrations of methanol extract from 6.25 to
400 mg/mL all showed inhibitory effect on the mycelial growth of B.
cinerea and P. capsici, and there was a liner relationship between
log10-transformed concentration of methanol extract and probittransformed
inhibitory rate on the mycelial growth of B. cinerea (y
5 3.0229 1 0.9086x, R2 5 0.9908) and P. capsici (y 5 2.9523 1
1.2056x, R2 5 0.9428) (Fig. 2). The methanol extract showed
stronger inhibitory effect on P. capsici than B. cinerea when its
concentration was higher than 12.5 mg/mL where methanol extract
at 1000 mg/mL (relative to 78 mL cell-free filtrate) showed an
inhibitory rate of 87.5% (probit 5 6.15) and 66.6% (probit 5 5.43)
on the mycelial growth of P. capsici and B. cinerea, respectively. The
EC50 of methanol extract on P. capsici and B. cinerea was 49.94 and
149.92 mg/mL, respectively.