Harmonia axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) in the Cities of Moscow and Yalta: Its Competition with Native Species of Coccinellids and the Influence of Parasitoids on Its Number

摘要

The Asian ladybird Harmonia axyridis is an invasive species that is rapidly spreading around the world. Occupying new territories, H. axyridis often causes a decrease in the biodiversity of native species of coccinellids, competing with them for food resources. A comparison of H. axyridis with six species of lady-birds was made in terms of the ratio of the number of individuals and the degree of infestation with parasitoids. In the city of Moscow, the most widespread species of ladybirds was Adalia bipunctata (67.1%); H. axyridis ranks second (16.5%). The total infestation of H. axyridis pupae with parasitoids is 1.8% in Moscow and 12.2% in Yalta. Infestation with parasitoids of other ladybird species in Moscow is much higher: from 11.0% to 36.4%. Thus, parasitoids effectively regulate the number of the native ladybird species, but have an insignificant effect on the number of the invasive species H. axyridis.