Euwallacea validus
Wood, 1982: In Japan it breeds in logs, stumps, and unthrifty material larger than 8 cm in diameter. In southern Japan and throughout southeast Asia to Sri Lanka, it is replaced by the superficially similar interjectus Blandford, with which it is easily confused. Rabaglia et al. 1996: This Asian species was first reported from Nassau County, NY in 1976. It is now common throughout the Mid-Atlantic states and as far south as Louisiana. It is easily distinguished from other North American Xyleborina, but is very similar to Euwallacea interjectus (Blandford) a widely distributed Asian species. Ohno (1991) distinguishes E. validus from E. interjectus based on the dull surface of the declivity, and the lack of granules of the lower half of the declivital interstriae 2. Specimens in North America have been seen with varying degrees of these characters. S. Wood (personal communication) stated that E. interjectus also may be established in the United States. Further study is needed on these populations in North America and the validity of these characters. Wood, 2007: Adults bore into the wood of unthrifty, broken, or cut branches where they establish their brood chambers. They have been reported to kill healthy, vigorous plants under certain circumstances. Beaver and Liu, 2010: Hijii et al. (1991) briefly characterise the gallery system and the effects of associated fungi on the surrounding wood. Shibata et al. (1994) describe the flight period of the species in Japan.