Farmer beetle finds suitable host trees by tracing scent of its fungus crop
The alnus ambrosia beetle Xylosandrus germanus, also known as the black stem borer, was accidentally introduced by humans from its native east Asia to North America and Europe around the beginning of the 20th century. X. germanus is a so-called ambrosia beetle, which means that it farms its own food, a specialized fungal symbiont that it "sows" and tends inside the galleries that it digs inside wood. The ambrosia…