Abstract
The influence of inlet air temperature on the exposure period required to kill immature Rhyzopertha dominica was determined by heating infested wheat in a batch-operated fluid bed. The LT 99.9 values for 500 and 1000 g loads heated with air at 80°C were 110 and 222 s respectively. Equivalent values for air at 140°C were 25 and 43 s. There was a marked discontinuity in the relationship between 1 LT value and inlet air temperature at about 125°C, with 1 LT value changing more rapidly with air temperatures greater than 125°C even though maximal grain temperatures were essentially constant. The slopes of the relationships between 1 LT value and air temperature differed with load and, thereby, provided a further indication that rate of heating influences mortality. The grain temperatures achieved by such exposures, i.e. 62–73°C, are unlikely to harm wheat, barley and oats of 12% m.c. or less.
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