Abstract
The effect of a paper sheet treated with an inorganic material, containing boric acid (1.0g/m2), was compared with that treated with organophosphate insecticides, Fenthion (1.0g/m2) and Fenitrothion (1.5g/m2). When the sheets were incorporated into food powder, boric acid was not so effective as Fenthion and Fenitrothion against the two mite species. When the mites were exposed directly onto the sheets, boric acid sheet was as effective as others. This may be due to non-volatility of the boric acid material. This non-volatile material would produce no air pollution though mites have to come into direct contact with the sheet to be killed.
