Cross-Inoculation of Commercial Forestry, Amenity, and Horticulture Tree Species with Isolates Collected from Different Host Species.

has caused significant losses in forestry productivity in Indonesia and neighboring nations. It also infects horticultural trees, but the host range of individual isolates of is poorly studied. So, this study aimed to better understand the potential host range and evaluate aggressiveness against forestry and fruit tree species of isolated from various tree species in Indonesia. Five isolates, four from different tree species and one from the shot-hole borer , were used to inoculate seven fruit and six forest tree species, including and . Many of the inoculated trees produced typical canker disease symptoms, such as rough, swollen, and cracked lesions on the bark, but some trees did not have any external symptoms. Mortality in the most susceptible clone of was 40% within 8 weeks. Forest tree species were more susceptible than fruit trees, with the length of xylem discoloration ranging from 0.4 to 101 cm. In fruit trees, the average extent of xylem discoloration was lower, ranging from 0.4 to 20.5 cm; however, mortalities were recorded in two fruit tree species, and . Host-isolate interaction was evident; isolate Ep106C from caused the greatest xylem discoloration in sp., whereas Hy163C from was the most damaging in , , and . Increasingly globalized food and fiber systems increase risk of disease spread, and the serious threat of incursions into countries where it is not present must be evaluated more thoroughly.