Some Effects of Infrared Irradiation on the Mortality of Immature Insects in Kernels of Rough Rice

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Abstract
Samples of rough rice containing all stages of rice weevils, Sitophilus oryzae (L.), lesser grain borers, Rhyzopertha dominica (F.), and Angoumois grain moth, Sitotroga cerealella (Olivier), were treated with a gas-fired infrared heater. Various intensities of heat, irradiation periods, and ages of immature insects were employed and their effects on insect emergence determined. The rice weevil was most susceptible to infrared treatments, followed by the Angoumois grain moth, and the lesser grain borer was most resistant. The data indicated that emergence of all three species was stimulated by treatments at the lower temperatures. In the intermediate temperature range, emergence decreased as intensity increased. However, in the high temperature range, emergence was reduced as the intensity diminished. In the low temperature range, only the rice weevil showed a lower emergence as intensity was decreased.

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