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Distribution map of the collected egg masses for Halyomorpha halys, showing the emergence of the two exotic parasitoids in northern Italy and Switzerland (survey methods a, b and c): (A) Trissolcus japonicus and (B) Trissolcus mitsukurii. The heatmap is based on the abundance of collected egg masses of H. halys where orange reflect a low number and red a high number of egg masses. Sentinel egg mass records are derived from Stahl et al. [21] and Zapponi et al. [23].
