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Current status of Corythuca ciliata in Europe.

Corythuca ciliata, a N. American heteropteran, has been spreading on plane in Europe since 1964 and is now certainly present in Italy, Yugoslavia, France, Hungary, Spain, Austria and Switzerland, and probably in some other countries. Besides weakening the trees, the insect much diminishes their amenity value and is a direct nuisance to man. Its biology and control are reviewed, with emphasis on the possibilities for a biological or integrated approach (IOBC/WPRS working group). Though several countries remain uninfested, the insect's capacity for natural spread makes it unlikely that phytosanitary measures would serve much purpose.