tweak one of those estimates and the results change dramatically.
Someone made a similar point on Bee-L recently.
If you lost 5% foragers over and above normal losses over a few days it would be almost unnoticeable - but might make the difference between a colony producing some surplus honey or none at all.
The commercial beekeepers in particular seem to work on very tight margins.
Maybe in a worst case scenario is could be the trigger for collapse over winter.
Bees in the UK certainly manage a surplus foraging on the neonicotinoid treated oil seed rape which suggests that there is no significant loss of foragers occurring.
The default position is that pesticides are not good for bees, some are harmful, some are very dangerous so what percentage loss/damage is acceptable.
And again the ban the neonicotinoid people need to be really careful about getting what they wish for if the replacement/older stuff is going to be worse.