Thanks Nancy. I was not meaning to imply there was silver bullet but quite the opposite according to honeybeehealthcoalition information. It would seem that there are different recommended treatments for different population levels. I did think the essential oils formulations were attractive, i guess because of stuff like honey bee health, and the prominence of using them to attract swarms. stands to reason though that if essential oils are poisonous to humans they could have negative effects on other life. Anything in the inappropriate amount is toxic. Oxygen, water(another chemical). Its easy to discount water as a chemical since it is so common and essential, but i guess that's the boat i put myself into, to choose the least toxic measure. The honey bee health coalition more or less recommended OA only twice a year, and other treatments were in higher favor at other time, nectar flow and brooding...I didn't absorb it all yet. I need more study and more input to decide the way that will work best for me. I have taken to heart there needs to be a tiered effort to keep the mites under control. The attractive thing about the mineral oil as it was sold to me, it is made to appear a one size fits all solution that has few negatives and few restrictions on use. I am being schooled now, and appreciate the time everyone has taken to guide me towards a better way to keep bees. I kind of thought from the popularity of the OA in this post that it would be a treatment that could be used with impunity. Is OA your preferred method Nancy? Do you use preemptive measures, or react to the problems when you KNOW they are present?