Propolis with alcohol is being used in any countries against varroa. I have used it against Phythophtora in citrus, and ancient Romans and Boers used propolis to cure wounds.
A citrus trunk with fungus
http://img136.imageshack.us/img136/8057/dsc05949sj7.jpgThat trunk a month later after propolis aplication
http://img143.imageshack.us/img143/2428/dsc06106kd9.jpgThis magic potion, -magic because it has not been studied enough- is really nice, you can add a few honey and would be better than the "Cognac Napoleon".
Don´t forget that you have to use drinking alcohol, like aquavit, eau de vie, kümmel.
Salud!