Rubiyo, R., Purwantara, A. and Sudarsono, S. 2010. Chitinase and Peroxidase Activities, Stomatal Density and Resistance of CocoaAgainst Black Pod Disease. Pelita Perkebunan (a Coffee and Cocoa Research Journal). 26, 2 (Aug. 2010). DOI:https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v26i2.129.