| Date | Site | OS Grid Ref | Stage | Quantity | Comment |
|---|---|---|---|---|---|
| 24 Sep 2016 | Thornton-le-Moors | SJ4474 | Mine | 1 | |
| 18 Sep 2016 | Acton | SJ6352 | Mine | 1+ | |
| 10 Sep 2016 | Waverton | SJ4663 | Mine | 1+ | |
| 15 Nov 2014 | Shotwick | SJ3371 | Mine | 1+ | on elm |
| 03 Nov 2014 | Littleton | SJ4466 | Mine | 1+ | on elm |
| 12 Oct 2014 | Barbridge | SJ6156 | Mine | 1+ | |
| 20 Sep 2014 | Norton Priory, Runcorn | SJ5482 | Mine | 1+ | SJ54758267, on English Elm leaves, local |
| 03 Nov 2013 | Great Sutton | SJ3875 | Mine | 1+ | on elm, exit hole underside |
| 29 Sep 2013 | Burton Saltmarsh | SJ2974 | Mine | 1+ | Denhall, on Elm |
| 25 Sep 2013 | Little Leigh | SJ6076 | Mine | 1+ | |
| 30 Oct 2011 | Churton | SJ4256 | Mine | 1+ | |
| 01 Oct 2011 | Hooton | SJ3678 | Mine | 1+ | |
| 26 Sep 2011 | Delamere Forest | SJ5571 | Mine | 1+ | |
| 23 Sep 2011 | Burton Village | SJ3375 | Mine | 1+ | egg on underside of elm |
| 14 Aug 2011 | Norton Priory Walled Garden | SJ548834 | Mine | 5 | |
| 20 Sep 2010 | Cedar House, Chester Zoo | SJ415704 | Mine | 1 | grid reference provided SJ41567043, larva exited on underside of leaf of elm |
| 06 Sep 2010 | Chester Zoo | SJ4170 | Mine | 1+ | |
| 06 Sep 2010 | Chester Zoo | SJ4070 | Mine | 1+ | |
| 02 Aug 2009 | Thornton-le-Moors | SJ4474 | Mine | 5 | Mines on Elm |
| 16 Sep 2006 | Chester | SJ4067 | Mine | 1+ | |
| 09 Sep 2006 | Churton | SJ4156 | Mine | 1+ | |
| 09 Sep 2006 | Farndon | SJ4154 | Mine | 1+ | |
| 15 Oct 2005 | Blackamoor Wood Frodsham | SJ5577 | Mine | 1+ | |
| 15 Oct 2005 | Aston | SJ5677 | Mine | 1+ | in Bank Rough |
| 18 Sep 2004 | Hockenhull | SJ4865 | Mine | 1+ | |
| 12 Sep 2004 | Churton / Coddington | SJ4355 | Mine | 1+ | |
| 22 Sep 2002 | Darnhall | SJ6363 | Mine | 1+ | |
| 20 Sep 2002 | Bird's Wood, Aston | SJ5678 | Mine | 1+ | |
| 18 Sep 2002 | Kings Marsh | SJ4255 | Mine | 1+ | |
| 15 Sep 2002 | Aldford | SJ4259 | Mine | 1+ | |
| 15 Sep 2002 | Aldford | SJ4159 | Mine | 1+ | |
| 11 Aug 2002 | Little Leigh | SJ6175 | Larval | 1+ | |
| 18 Nov 2001 | Wimboldsley Wood, Weaver Valley | SJ6764 | Larval | 1+ | |
| 04 Nov 2001 | Arley Green | SJ6880 | Larval | 1+ | |
| 28 Oct 2001 | Worleston | SJ6556 | Mine | 1+ | |
| 28 Oct 2001 | Worleston | SJ6555 | Mine | 1+ | |
| 28 Oct 2001 | Poole | SJ6455 | Mine | 1+ | |
| 13 Oct 2001 | Weaver Valley, Hartford | SJ6471 | Mine | 1+ | |
| 10 Sep 2000 | Blacon | SJ3867 | Mine | 1+ | Clifton Road |
| 03 Oct 1998 | Poulton | SJ3959 | Larval | 1+ | |
| 05 Oct 1997 | Sound Common | SJ6247 | Larval | 1+ | |
| 1990 | Cheshire | Unknown | Not recorded | 1+ | Included in MS checklist by compiler, but without authority or locality |