Environmental Entomology (2007) 36, 1147-1153

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Chiara Ferracini and Alberto Alma (2007)
Evaluation of the community of native eulophid parasitoids on Cameraria ohridella Deschka and Dimic in urban areas
Environmental Entomology 36 (5), 1147-1153
Abstract: The parasitoid complex associated with the exotic leafminer Cameraria ohridella Deschka and Dimic (Lepidoptera: Gracillariidae), which attacks horse chestnut (Aesculus hippocastanum L.), was studied in the urban environment of Turin (northern Italy). The studies were carried out over 5 yr after the first detection of the pest in our region in 1999. To evaluate parasitism, 438,029 leaf mines were examined over the 5-yr period, of which 29,033 were found to be parasitized (6.6%). Also, ornamental broadleaf trees attacked by other native gracillariid leafminers and located in the proximity of the target horse chestnut trees were sampled. A total of 11 parasitoid species (Hymenoptera: Eulophidae) were recorded on C. ohridella, and the most common species were Minotetrastichus frontalis (Nees), Closterocerus trifasciatus Westwood, and Pnigalio agraules (Walker). The first species accounted for >77.5% of all parasitoids collected. Cirrospilus talitzkii Boucek was found for the first time in 2005. The high population level of the pest and the low parasitism rate show that the parasitoid complex is currently inadequate to contain C. ohridella populations effectively. The most frequent parasitoids of the moth were also found on the most common broadleaf trees in the studied area, showing how native leafminer parasitoid species are able to switch to other hosts. These results show that both native and broadleaf plants species may potentially provide an important reservoir of parasitic wasps to help protect a simple biotope, such as the urban environment, from pests.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Alberto Alma

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cameraria ohridella Horse-chestnut/buckeye (Aesculus) Italy
Pnigalio agraules (parasitoid) Cameraria ohridella Horse-chestnut/buckeye (Aesculus) Italy
Closterocerus trifasciatus (parasitoid) Cameraria ohridella Horse-chestnut/buckeye (Aesculus) Italy
Minotetrastichus frontalis (parasitoid) Cameraria ohridella Horse-chestnut/buckeye (Aesculus) Italy
Cirrospilus talitzkii (parasitoid) Cameraria ohridella Horse-chestnut/buckeye (Aesculus) Italy