It can be susceptible to attack by Japanese Beetle. As with the species overall, damage caused by Japanese Beetle is relatively slight. Others, such as the Japanese beetle, are plant-eaters. Planting rue helps in deterring the Japanese beetle, a major agricultural pest. "Xanthogaleruca luteola" and Japanese beetle. "Zelkova serrata" also shows good resistance to elm leaf beetle and Japanese beetle. It is sometimes confused with the Japanese beetle, which is however, larger and more colorful. Another unwelcome immigrant to North America is the Japanese beetle "Popillia japonica". "Xanthogaleruca luteola" , but not to the Japanese beetle, which can cause extensive foliar damage. The Japanese beetle ("Popillia japonica") is a species of scarab beetle.