lw3887's picture

Elm Beetle Damage?

Observed: 5th November 2009 By: lw3887
05112009128
05112009129
Description:

Beetle galleries found on dead Wych Elm in small wood.

Identifications
Species interactions

No interactions present.

Comments

dshubble's picture

Scolytus species

These can often be separated by size. If the central vertical egg gallery and radiating larval galleries are 2-6cm long, it's S. multistriatus, if larger (to 10 and 15cm respectively), it's S. scolytus.

Exobasidium's picture

Scolytus

The two species of Scolytus using elm construct vertical, one-armed mother galleries. Normally S. scolytus attacks the tree trunk whereas S, multistriatus uses the small branches. The mother galleries on your photograph are two-armed and horizontal typical of the large ash bark beetle. Look at the bark on your second photograph and I am sure this is ash bark not elm bark.

Rob Coleman's picture

I agree this is Ash bark

I agree this is Ash bark beetle - I think the latest revisied name for this is Hylesinus varius (formly Leperisinus varius)

Rob Coleman