Abstract
The toxicity of oxalic and citric acid to Varroa destructorAnderson and Trueman was stud- ied with a laboratory assay. A contact test was used for the bioassay. Capsules were sprayed with solu- tions of the acids in a Potter tower and allowed to dry. Slight but significant differences in toxicity of oxalic acid were found among mites from different brood stages; the median lethal density for mites from pupae with white eyes was 1.49 μg/cm 2 . Citric acid was less toxic than oxalic acid. The addi- tion of sucrose to oxalic acid made the material more hygroscopic and the mortality of the mites increased at 75% R.H. Glycerol showed a similar synergic activity irrespective of relative humidity. Varroa destructor / bioassay / oxalic acid / citric acid / sucrose / glycerol / synergism
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