Entomofauna leszczyny (Corylus avellana L.) przy dodatkowej ochronie biopreparatami Entomofauna of hazel (Corylus avellana L.) under additional protection with bio-products Journal title: Progress in Plant Protection Authors: Emilia Ludwiczak, Mariusz Nietupski, BogumiĆ Markuszewski, Agnieszka Kosewska Subject(s):