Abstract
The influence of several biological and physical factors on the exposure time required to obtain a given level of mortality of immature Rhyzopertha dominica and Sitophilus oryzae exposed to air at 70 or 80°C in a fluidized bed of wheat was determined. The tolerances of five Australian populations of R. dominica differed little. In this species, median tolerance and variance increased as the age span of the exposed insects widened from 0–7 to 0–35 days. Acclimation of R. dominica at 22 or 32°C and S. oryzae at 15 or 30°C before exposure had no appreciable influence on heat tolerance. Changing the initial grain temperature from 32 to 22°C did not alter LT values for R. dominica. However, the LT 99.9s for both warm and cold acclimated S. oryzae in 15°C grain were greater than those in 30°C grain. The LT 99.9s for R. dominica in wheat of 14% m.c. exceeded those in 11.3% m.c. wheat. Heating curves showed that the time taken for cold or moist grain to reach a given high temperature was extended.
Published Version
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