Having bees with "chewed up wings" commonly is found with a heavy Varroa mite infestation. If there are several mites per cell, the pupae may not emerge, or if it does, the wings are not developed due to parasitization. I suggest sampling for Varroa using ether roll, sticky board, or examining drone or worker pupae for mites. good luck, John John A. Skinner 218 Ellington Hall Extension Apiculturist University of Tennessee [log in to unmask] Knoxville, TN 37901 (423)974-7138