>  At any rate here is a link that claims essential oils are sex hormone disruptors at very low concentrations in humans.

Do bees have testosterone?  And who uses tea tree oil or lavender oil in their hives?

>I have to wonder about a possible link between use of such oils and early queen failures.

We have used only thymol as a varroa treatment since it was found here in 1997.  Absolutely no evidence of early queen failure.  We have plenty of queens that live 3-4 years.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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