Patogenisitas Rhizoctonia solani pada Semai Pinus merkusii dan Acacia mangium

Abstract

Pathogenicity of Rhuoctonia solani was studied by evaluating the ability of the pathogen to attack several ages of Pinus merkzuii and Acacia mangium seedlings. Results showed that R solani altacked P. merkusii from seed stage up to seven week-old seedlings, while eight week-old ones were free from the pathogen's attack On A. mangium, 16 day-old seedlings were uninfected by R. solani, while 12 day-old ones were slill attacked by the pathogen. Pathogenesis of R. solani wns abo studied by evaluating the activities of celluldytic and pectolyric enzymes produced by the fungi and compared them with the activities of the same enzymes produced by Fusarium oxysporum. Result showed that R. solani's cellulolytic enzymes activify. reflected by the activity of CI-cellulase, was lower compared with that of F. oxysporum. On the other hand, R. solani was more intensive degrading pectin medium than F. oxysporum, such phenomenon reflected higher activity ofpectolytic enzymes activity of R. solani compared with that of F. oxysporum.