Cryptolestes ferrugineus (Stephens) (Coleoptera: Laemophloeidae) is the most prevalent insect species in granaries in western Canada. Their movement and distribution at different environmental conditions provide important information for insect detection and control and for models of their distribution in grain bins. The distribution and wandering movement of C. ferrugineus adults were studied in a 100 by 500 by 500-mm wheat (14.5 ± 0.2% moisture content) chamber with or without a 5°C/m temperature gradient. In the grain chamber at a uniform temperature, adults dispersed homogeneously in each horizontal layer and heterogeneously in the vertical direction when the temperature was 22.5–30°C. Adults moved toward a warmer temperature and in the direction of gravity at the same time in the grain chamber with temperature gradients in the horizontal or/and vertical directions. Adult movement and distribution in the two-dimensional chamber could be represented by published data obtained in one-dimensional columns. The movement and distribution of females (mixed ages) were not significantly different from those of males (mixed ages) in response to temperature gradients and gravity. Wandering movement of adults was restricted by temperature gradients.
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