Sample sizes, means (± SE) of different infestation parameters in resident brood of Italian and Russian honey bee colonies, and results of the student’s t-tests.

NR = no progeny. Rows with different letters are significantly different at P < 0.05. ns = not significant. Sample sizes, means (± SE) of different infestation parameters in resident brood of Italian and Russian honey bee colonies, and results of the student’s t-tests.