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