Additional cymiazole salts and oxalic, salicylic, citric and boric acids were received. The study aimed at determining the efficacy of controlling Varroa destructor mites with these salts and their toxicity for honey-bees. The most effective were the boric acid salts (efficacy up to 98.1%), salicylic acid (efficacy up to 96.0%) and the mixture of boric acid salt and oxalic acid salt (efficacy up to 98.8%). The honeybee colonies were treated with sugar syrup (1:1) containing about 200 mg of salt per 1 dm³. The acute toxicity of these salts was lower than the toxicity of the initial cymiazole. Values of LD₅₀ of the above salts were higher than 100 mg/bee.
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