Thursday, 30 October 2008

Horse Chestnut Leaf - Miner

Derek Parkinson recorded 366a Horse Chestnut Leaf-miner Cameraria ohridella at Norwood Green over the weekend,this is the first record of this species in Calderdale.Many thanks to Derek for this information.This pasage below and Photo are taken from the excellent UKmoths site ......-

This species was discovered near Macedonia in 1985, and since then has spread rapidly to other countries in Europe. It was first discovered in Britain at Wimbledon in south-west London in 2002, but possibly had arrived the previous year, as it was quite plentiful. It is thought that the species may be expanding partially due to accidental transportation by man, either by road or rail. It has now been found quite extensively in the south-east of England.
The larva mines the leaves of horse chestnut (Aesculus hippocastanum) causing noticeable brown blotches, often many to one leaf. There is however, a similar-looking fungus which can cause confusion.
The adult moths resemble other Gracillariidae, although are quite distinctively dark reddish-brown with a noticeable white frons. It is thought that three generations exist.
Many thanks to UKmoths and Derek for this info.


Paul Talbot..aka Moffman said...

Oh dear, bad news indeed for the comparatively few horse chesnut trees in Calderdale. Hope it does not spread.

AndyC said...

hi Paul,what is the extent of the damage that these Leaf -mines do.??

Paul Talbot..aka Moffman said...

Hi Andy
They are a major pest of Horse Chestnut in Europe and in severe infestations can kill the tree by weakening it and opening it up to viral and other ifections.

charlie streets said...

Not seen round my way yet,only the fungal spots.With up to three generations a year,trees truly do get infested, with some individual leaves having dozens of mines on them.