Based on the method of Liu et al. (2007), a stock solution of
chitosan was diluted with sterile, molten PDA to achieve concentrations
of 1 or 5 mg/mL, and the pH of medium was adjusted to 5.6
by 0.1 N of HCl. Ten milliliters of the chitosan mediumwas added to
each Petri dish and the medium was allowed to solidify. Fifty
microliter aliquots of conidial suspensions at 1 106 spores/mL
were plated in each Petri dish (60 mm in diameter) and the inoculum
spread across the surface. PDA without chitosan served as the
control. The cultures were incubated at 25 C for 12 h. More than
200 spores per treatment were examined for germination and
germ tube length. Each treatment contained three replicates and
the experiment was repeated three times.