> Have these applicators proven effective?

Dennis vanEngelsdorp tested it (without HBH) and found it to be very
effective.  He did not experience any queen kill.

vanEngelsdorp, et al
J. Econ. Entomol. 101(2): 256Ð264 (2008)
ABSTRACT... In this
study, a 17-h application of 50% formic acid effectively killed mites in
capped worker brood and on
adult bees without harming queens or uncapped brood. . The short-term formic
acid treatment
killed >60% of varroa mites in capped worker brood; thus, it is a promising
tool for beekeepers,
especially when such treatments are necessary during the nectarflow.

Randy Oliver

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