Rare micro moth in Worcestershire

On 14th January 2011, Danny Arnold trapped a small Tortrix micro moth in a 125-watt MV trap at his constant effort site at Upper Rochford (Worcestershire). The moth didn't fit any of the usual suspects flying at this time of year so, looking further afield, a photograph was taken and genitalia examination undertaken. Following some deliberation and detective work, the findings were submitted to Tony Simpson, the County Moth Recorder, for consideration as Acleris abietana (1059).

Worcestershire's first record of Acleris abietana (photo: Danny Arnold).

UK Moths states that the first British record of this species was in Scotland in 1965 and since then it has become established in a number of localities in Scotland and northern England, mainly in Perthshire, Durham and importantly Northumberland, where it has been recorded from seven sites. The only previous record from southern England was an adult caught at The Doward (Herefordshire) on 26th April 2008, by Jeff Rush.

The larvae feed on coniferous trees, such as Scots Pine and Grand Fir, and it is thought that it originated initially from Scandinavia, brought in on imported trees that were subsequently planted. The adults can emerge as early as August and following a long midwinter hibernation fly again from early spring or even during mild late-winter weather. Although the true status of this moth is clearly difficult to ascertain, its long-term future may not be quite so bright, as the Forestry Commission have already embarked on a systematic removal of large exotic conifer plantations. However, its catholic choice of food plants should enable it to survive in native trees and arboretums throughout its increasing range.

Once again, the Teme Valley has proved itself as being one of the most productive Lepidoptera habitats in Worcestershire, this latest addition being its fifth 'first record for Worcestershire (VC 37)' in the last two years. For more information on wildlife in the area, visit www.temevalleywildlife.com.