Abstract
Experiments are described in which data on developmental rate of the lesser grain borer, Rhyzopertha dominica, were collected over a wide range of temperatures (15–39°C) and relative humidities (20–70%). The results differed from previously published work in that development was completed at temperatures as low as 18°C, although only at relative humidities of 55% or above. Development was not completed at less than 30% r.h. at any temperature. In general, the rate of development observed in this study was lower than that in the literature. The data collected from these experiments were used to develop submodels for emergence pattern and rate of development. The derived model of development rate includes both exponential and logarithmic functions of temperature and humidity and does reflect well the critical observed interaction between temperature and relative humidity. This study has important implications for the effective use of grain-cooling with ambient aeration to restrict insect population growth.
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