Habitual differences of Phyllonorycter salictella (Zeller, 1846) and P. heringiella (Grönlien, 1932) (Lepidoptera: Gracillariidae) in two Finnish materials; a problem pair
Habitual differences of Phyllonorycter salictella (Zeller, 1846) and P. heringiella (Grönlien, 1932) (Lepidoptera: Gracillariidae) in two Finnish materials; a problem pair