Peter Edwards writes:
Not my table - I was quoting from Morse & Hooper!
PB
Sorry if that was unclear. From the 3rd Edition of Honey Bee Pests, Predators, & Diseases by Morse & Flottum, (1997) we get the following recommended sample sizes (per colony):
nosema 10 worker bees
trachael mites 50
dying adults 100
varroa mites 200-400