How emerald ash borers kill trees throughout North America點閱：1
出版社：Next Animation Studio
集叢名：All about animals Natural and Social Science Animation.4,動物大觀園
The emerald ash borer (Agrilus planipennis) is an invasive species from Asia that has infected at least 50-100 million ash trees throughout North America. The insect was first detected near Detroit in 2002 and is now present in at least 16 US states and two Canadian provinces. It feeds on white, green, blue and black ash trees in the US, which have no natural defense against it. Researchers say the beetle probably entered the US via Michigan after arriving in shipping containers.