Efficacy of Various Acaricides and Compositional Formula against Dermatophagoides pteronyssinus (Acari: Astigmata)

Objective To decrease the concentration of single chemical acaricide and certify the efficacy of dust mite control by dispensing effective acaricides. Methods The efficacy of 6 kinds of selected chemical acaricides and their compositional formula against Dermatophagoides pteronyssinus was tested under laboratory conditions according to the regulation method from GB 13917.1-92. Results After 24 hours of spraying acaricides, the acaricidal efficacy of 1.8% benzyl benzoate reaches to 100% ; the efficiency of the formula of 4% disodium octaborate tetrahydrate, 0.05% hyamine and 0.9% benzyl benzoate is 88% ; the effectiveness of the other four acaricides are all under 70%. Conclusions 1.8% benzyl benzoate has shown the best immediate effectiveness among these 6 acaricides, followed by the formula of 4% disodium octaborate tetrahydrate, 0.05% hyamine and 0.9% benzyl benzoate. The results indicate that the compositional formula of acaricides can decrease the concentration of single acaricide and avoid the water-insolubility of benzyl benzoate without compromising practical acaricidal efficacy against dust mites. The formula can control dust mite allergen through general longterm using in houses.