Uji Patogenisitas Patogen Hawar Daun pada Tanaman Kayu Afrika (Maesopsis Eminii Engl.) di Persemaian Permanen BPDAS Bogor

Abstract

African wood (Maesopsis eminii Engl.) is a fast-growing tree species which are now begin to be exploited. This research is aimed to identify the types of pathogens, disease incidence and severity of leaf blight disease in African wood seedlings. Methods include field observations, isolation of symptomatic leaf blight and subsequent testing of Koch's postulates. Results of field observations indicating that the incidence of the disease is at 99.44%, while the severity of the disease by 8.85%. When isolation of symptomatic leaf blight was found 8 kinds of isolates that have different colors. The isolates were found in plants are then inoculated on African wood, and almost all isolates can causing the symptoms of leaf blight. The result of Koch's postulates inoculated leaf, found two types of isolates were identical to the initial isolation. Pathogenicity test results showing isolates with 1.1 code has the highest percentage value of disease incidence and severity than the other isolates. The identification results show the isolates with 1.1 code is a type of fungus characterized by having sectional hyphae and contained conidia, this fungus belongs to a class of Deuteromycetes