1. Apiaries tested should be sufficiently distant from neighbouring apiaries to avoid disturbance and reduce risk for re-infestation.
Type and availability of food sources should be recorded.
2. As a general principle, if studies are carried out at different apiaries, habitats should be comparable (access to similar forage and exposure to similar climatic conditions).
If these conditions are not met the sample size should be adapted (number of apiaries increased) to take these differences into account.
3. Depending on the mode of dispersion of the product, control and test apiaries should be distant enough to prevent the contamination of control groups by the tested product by drifting foragers and drones or robbers.
Synthetic acaricides have been shown to contaminate control hives placed in the same apiary (Allsopp, 2006)