Abstract
House dust mite cultures are at times contaminated by TYROPHAGUS PUTRESCENTIAE (Schrank, 1781). The usual control of T. putrescentiae involves eidier acaricides (Hirakoso, Miyamoto, Mizutani, Miyazaki & Shirasaka, 1971, Jap. J. Sanit. Zool. 22 : 62–65) or low humidity (Hilsenhoff & Dicke, 1963, Marketing Research Report no. 599, USDA, in cooperation with Univ. Wise. Agr. Exp. Sta., 46 p.). The Critical Equilibrium Activity (CEA) for fasting females of T. putrescentiae is ca 0.84 and their halflife for water exchange is 6.9 hr (Cutcher, 1970, Ph.D. Thesis, Ohio State Univ., Columbus, 61 p.). The CEA for fasting females of the American house dust mite, DERMATOPHAGOIDES FARINAE Hughes, 1961, is 0.70 (Larson, 1969, Ph.D. Thesis, Ohio State Univ., Columbus, 35 p.) with a half-life of 27.7 hr (Arlian, 1972, Ph.D. Thesis, Ohio State Univ., Columbus, 93 p.). Hypopal forms of T. putrescentiae are either very rare or do not exist (Hughes, 1961, Min. Agr. Fish. Food, London, 287 p.). Under certain conditions a quiescent protonymph with a half-life of 218.7 hr is fairly common in cultures of D. farinae (Ellingsen, 1974, Ph.D. Thesis, Ohio State Univ., Columbus, 82 p.). In addition, I have calculated from published data (Arlian & Wharton, 1974, J. Ins. Physiol. 20 : 1063–77) that the half-life of active females of D. farinae is 230 hr after the first 14 hr of exposure to P2O5.
Published Version
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