Scolytus rugulosus

Not to be confused with Euwallacea fornicatus, aka polyphagous shot hole borer or tea shot hole borer

Scolytus rugulosus, known generally as shothole borer (variously spelt hyphenated or as two words), is a species of typical bark beetle in the family Curculionidae. Other common names include the fruit tree bark beetle and apple tree beetle.^[1][2][3]

Shothole borer
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Cucujiformia
Family:	Curculionidae
Genus:	Scolytus
Species:	S. rugulosus
Binomial name
Scolytus rugulosus (Müller, 1818)

Etymology

Rugulosus means "finely wrinkled". The species was originally named by Otto Friedrich Müller in 1818, as Bostrichus rugulosus, and renamed to Scolytus rugulosus by him.^[3]

Distribution

Scolytus rugulosus is found in the Americas, Europe, and North Asia, probably native to Europe and introduced elsewhere.^[1][2][3]

Food

The shot-hole borer lives on various species of Rosaceae, especially damaged branches and trunks.^[3]

Life cycle

They spend winter as mature larvae or pupae in tunnels just under the bark of the tree, with adults emerging in late spring (May in the northern hemisphere). The females fly to susceptible trees where they bore into the cambium, laying eggs in pockets along the tunnel walls. Second-generation adults emerge in summer (mid-August in the northern hemisphere). There may be two or even three generations in a year.^[3]