Effects of Chitosan, Pectic Acid, Lysozyme, and Chitinase on the Growth of Several Phytopathogens

used as the basal culture medium (pH 5.6), Each of 18 phytopathogens was grown on the PDA mediurn containing a test materiai in a concentration of O,Ol, O.1, or 1.0 mgr'ml in a Petri dish (diameter 8.Scm). A control was run with the PDA medium conlaining no test matcrials, The test materials used ttre the lactate salt of highmolecular-weight (HMW)-chitosan [crab shell, MW 400,OOO, the degree of substitution O.95 for NAcl,