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Invasive harlequin ladybird causes severe decline of two-spotted ladybird, new study shows
CABI scientists have led an 11-year study which shows how the invasive harlequin ladybird (
Harmonia axyridis) caused the severe decline of the two-spotted ladybird (
Adalia bipunctata) on broadleaved trees and shrubs in northern Switzerland.
Lead author Dr Marc Kenis, Head of Risk Analysis and Invasion Ecology based at CABI s Swiss Centre in Delémont, of the research - published in the journal
Insects - said the two-spotted ladybird was the most abundant ladybird at the 40 sites surveyed before the harlequin ladybird took hold between 2006 and 2017.
The scientists discovered that the harlequin ladybird - which is a predator native to Central and East Asia and whose presence was confirmed in Switzerland in 2004 - quickly dominated the broadleaved hedges representing 60-80% of all specimens collected in this habitat.