Re: Diatomaceous Earth Circle around Hive?
Keep in mind DE is fairly short lived and is basically destroyed with rain etc.
The most information I have found in regard to using it for control of mites is using it in a dusting pan for chickens. I have also heard of it being commonly used to dust entire chicken coops and runs. So the idea of dusting around your hives is not that far off track.
You don't apply it in a layer. it is a dusting that is most effective. There are reasons that a layer of it does not work as well. Insects tend to avoid it if it is to thick.
This is one link of several I found with information on applying it over a large area such as a lawn.
I can't say what effect covering it with mulch might have. possible a leaf covering or something like that. I do know the larva supposedly will travel a long way to find suitable ground to burrow into.
Significant Minority vs Insignificant Majority, 20% of causes produce 80% of the effects.