Effect of Stem Cracks on Infestations of Synanthedon bicingulata in Roadside Trees in Urban Landscapes in Korea

초록

The cherry tree borer, Synanthedon bicingulata (Staudinger), is considered a major boring pest on tree species belonging to the genus Prunus (Family Rosaceae). Among Prunus species, Prunus x yedoensis, the host species of S. bicingulata, is one of the most abundant roadside trees in the Republic of Korea. However, the lack of information on the infestation characteristics of S. bicingulata on P. x yedoensis hinders effective management of the roadside trees compared to those in orchards. This study aimed to investigate the infestation characteristics of S. bicingulata in relation to cracks, a common abiotic injury in roadside trees. During 2023, field investigations were conducted in three locations in the Republic of Korea, and a total of 211 infested P. x yedoensis trees were investigated. For the investigation, we counted the number of larval infestations of S. bicingulata in all P. x yedoensis planted as roadside trees. The infestation rate increased with the increasing diameter at breast height. Higher infestation rates by S. bicingulata were found in lower parts and on the south-facing tree trunk, where cracks were more concentrated. Also, significantly higher densities of S. bicingulata larval infestations occurred inside cracks than those outside. In consequence, targeting and managing cracks in tree trunks, particularly in the lower parts and on the south-facing side, is a key tactic to reduce larval infestation of S. bicingulata.

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