More than 500 insect pests in the Italian ecosystems are considered to be exotic (DISIE, 2008). About 200 of these species have been introduced and have established themselves in Italy since 1970. The intensification of plant trade between Italy and geographically distant commercial partners is considered to be one of the main causes of these introductions. Climatic abnormalities have also favored the spread and acclimation of these exotic organisms. Climatic change influences directly the establishment of poikilothermic insects by favoring the survival of a great number of introduced individuals or indirectly through the alterations induced in host phenology.
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