15.0931 Phyllocnistis citrella – New to Ireland

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Jul 212020
 

On 24th January I was in Sainsbury’s at Forestside, Belfast, Co. Down doing the weekly shop. I was well aware that oranges and lemons with leaves in GB supermarkets had been producing mines of the “snail trail” leaf mining micromoth Phyllocnistis citrella. I had searched in previous years without success. On a recent trip to Lanzarote I had found fresh mines on a lemon tree in Manrique’s garden so I was well tuned-in! My eyes were drawn to boxes of “Taste the Difference” easy-peel oranges as I could see that the fruit had sprays of leaves attached. I opened the first box and was somewhat amazed to see mines on the first leaves. In fact most boxes had the leaf mines. The mines are only in the leaf epidermis and on close inspection a thin line of black frass is visible. Fresh mines are white in appearance but after being vacated they quickly turn brown.

The oranges had been imported from Spain where this species can occur in pest proportions. Surprisingly there are no previous records of this adventive but having been alerted Ted Rolston and Andy Crory found mined leaves (and fruit) on oranges in a number of other outlets. Christmas is apparently the best time to look so you might find a welcome Xmas present if you look hard enough.

Dave Allen

4.088 Ectoedemia heringella – New to Ireland

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Jul 022020
 

4.088 BF36a. Ectoedemia heringella (Mariani, 1939)

On 5th May 2020 Jamie O’Neill posted images on Insects & Invertebrates Ireland Facebook page of an abundant leaf miner that he found on Evergreen Oak in Phoenix Park, Dublin. He putatively identified them as E. heringella. This was quickly confirmed by Stuart Dunlop and Dave Allen (DA) who also confirmed it, after consultation with Ken Bond, as “New to Ireland”. A few weeks later Philip Strickland contacted DA with images of the same species from the same locality but taken on 13th February 2017! The mines are persistent so can be found in any month of the year. The species has obviously been established here for a number of years but remained undetected. If it follows the same pattern as in GB, where it was first found close to Kew Gardens in London, then it will certainly colonise other parts of Ireland.

Horse Chestnut Leaf-miner Cameraria ohridella present in Ireland

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Aug 032014
 

Cameraria ohridella was first confirmed in Ireland in south Dublin during 2013. In recent weeks, (June & July 2014) as well as throughout Dublin, mines and adults have been noticed in Belfast, Cavan, Louth and Wicklow and while many searches of trees have been negative it is likely to be more widespread than the current distribution map indicates.

As I write this the 2 maps above are the same. The map on left will stay fixed as a snapshot of what is known on 1st Aug 2014, the right map will update when further sightings are confirmed.

We would like you to look for mines of this species in your area on Horse Chestnut trees (Conker Tree) While fresh mines are distinctive, the old mines are brown as is leaf blotch, a fungal disease which can be found, sometimes very extensively on practically all Horse Chestnut trees. For the inexperienced this blotch can be easily interpreted as mines. If in doubt it is probably blotch

If you feel you have a definite sighting of a mine, forward a photo via Ask an Expert
If we can confirm we will add your sighting to the map.

The following 3 photos, courtesy of Dave Allen indicate of what to look out for. the fresh mines are pale and obvious. Part of the mine is usually a darker blotch and frass and a caterpillar may be visible. The mines may join together and many caterpillars may be visible together. The most likely location on tree is low, usually within reach and often near the trunk. The caterpillar pupates inside the mine. The 2nd photo shows an exit case. These are often seen sticking out of the leaf. If it has fallen out then a hole is left. The 3rd photo shows many mines in a leaf.

Further information

Ukmoths
British Leafminers

Cameraria ohridella has a very recent history having been first observed in Macedonia in 1984. It was first observed in Britain in 2002
See wikipedia for more info

 Posted by at 17:28