Hardwood injury and mortality associated with two shot hole borers, Euwallacea spp., in the invaded region of southern California, USA, and the native region of Southeast Asia

摘要: We assessed the impact of polyphagous shot hole borer (PSHB), Euwallacea whitfordiodendrus (Schedl), and Kuroshio (KSHB), E. kuroshio Gomez Hulcr, on hardwood trees in southern California, southwestern China, northwestern Vietnam. The highest levels mortality were recorded from 10 39 tree species survey, these primarily native species. Two invasive borers represent relatively recent introductions USA, continue to spread cause injury several ornamental species. They originate Southeast Asia. Knowledge susceptibility wood-boring beetles is essential inform better pest management evaluate future risk for urban wildland forests. From 2012 2016, ground surveys conducted invaded regions at PSHB/KSHB-infested PSHB/KSHB-uninfested sites record In maple, Acer, willow, Salix, sycamore, Platanus, infested by either PSHB or KSHB high rates (> 70%), comparative rate infestation all surpased that PSHB, whereas surpassed KSHB. Mortality two maple caused exceeded 20%, background hardwoods was 2% uninfested areas. These data should land managers about most mortality, facilitate detection surveys, direct prophylactic treatments woodborers.