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Chill tolerance plays a crucial role that allows insect species to adapt to cold environments. Two Chinese geographical populations (Laibin and Yangzhou populations) were selected to understand the chill resistance and evolutionary potential in the  Ophraella communa , a biological control agent of the invasive common ragweed,  Ambrosia artemisiifolia . Super-cooling point assays, knockdown tests under static low-temperature conditions and determination of glycerol content were studied. ANOVAs indicated significant differences regarding chill coma recovery time, super-cooling point, and glycerol content across populations and sexes. The narrow-sense heritability ( h  2 ) estimates of cold resistance based on a parental half-sibling breeding design ranged from 0.39 to 0.53, and the  h  2  value was significantly higher in the Yangzhou population than in the Laibin population. Additive genetic variances were significantly different from zero for cold tolerance. The Yangzhou population of  O. communa  has a strong capability to quickly gain resistance to cold. We conclude that the  O. communa  beetle has a plasticity that can provide cold resistance in the changing climate conditions.

Heritability and Evolutionary Potential Drive Cold Hardiness in the Overwintering Ophraella communa Beetles