Photoperiod response influences both voltinism and impact in a biological control agent: comparing six sources of the loosestrife leaf beetle (Galerucella calmariensis) in a common environment.

Multivoltine insects, those having more than one generation per year, often use daylength as a cue for terminating reproduction and entering diapause prior to the onset of winter. In a common garden experiment in Corvallis, Oregon, USA (44.6°), we co…

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