Hylesinus fraxini (Panzer, 1779)
ash bark beetle
“bark rose” (from WSL.CH)
In spring the female bores a horizontal gallery in the bark, depositing a series of eggs, each one in a separate chamber. The emerging larvae then each make a short vertical gallery from their egg chamber. Before she can oviposition the female goes through a period of maturation feeding. She the bores in the green bark of a young tree. Repeated infections by a number of females may induce cankerous swellings, called bark roses.
distribution within Europe
Buhr (1964a), Dauphin & Aniotsbehere (1997a), Lukášová & Zimová (2015a), Roskam (2019a).