Cacopsylla ulmi

Cacopsylla ulmi is an insect of the Psyllidae family. It mainly feeds on Elm.[1] Cacopsylla ulmi is a widespread species in Europe, including Britain and the Balkans. Adults are 3.6–4.3 mm long. The head is 1–1.01 mm wide, with a vertex which is 0.5 mm wide and 0.24–0.28 mm long. The genal cones are laterally somewhat concave, and 0.25 mm long (Fig. 1). Antennae are 1.89–2.0 mm. Forewings are 3.5 mm long and 1.4 mm wide.[2]

Cacopsylla ulmi
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hemiptera
Suborder:
Sternorrhyncha
Superfamily:
Psylloidea
Family:
Psyllidae
Genus:
Cacopsylla
Species:
C. ulmi
Binomial name
Cacopsylla ulmi
Förster, 1848

The insect was first recorded in Britain by Elwes, who found a line of European White Elms Ulmus laevis in Devon infested with the insect in 1908, though without apparent detriment to the hosts. Elwes determined that the imagines did not hibernate, rather laid their eggs in autumn, suggesting to him a foreign origin. It was the first and only occasion Elwes encountered the insect in Britain.[3] Richens later observed that U. laevis was the only elm afflicted by C. ulmi at Kew.[4]

References
  1. Ossiannilsson, F. (1992). "The Psylloidea (Homoptera) of Fennoscandia and Denmark". Fauna Entomologica Scandinavica. E.J. Brill. 26.
  2. Jerinić-Prodanović, D. (2006). A new jumping louse, Cacopsylla ulmi Förster (Homoptera, Psyllidae) on elm in Serbia. Acta entomologica serbica. 2006, 11 (1/2): 11–18.
  3. Elwes, H. J. & Henry, A. (1913). The Trees of Great Britain & Ireland Archived 2016-03-03 at the Wayback Machine. Vol. VII.  p.1855. Republished 2004 Cambridge University Press, ISBN 9781108069380
  4. Richens, R. H. (1983). Elm.  p.64. Cambridge University Press.


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