I have seen the same reference, and I think I have seen it more than once. I am reasonably certain the reference was to temperatures below 70 F, during metamorphism. Should such exposure take place, I think that her subsequent fertility will be severely damaged. Lloyd Lloyd Spear, Owner of Ross Rounds, manufacturer of comb honey equipment for beekeepers and Sundance pollen traps. http://www.rossrounds.com [log in to unmask]