Investigation on different power levels and exposure periods of microwave radiations on developmental stages of the cowpea weevil, Callosobruchus maculatus Pic. (Col,. Bruchidae)

Cowpea weeevli Callosobruchus maculatus Pic., is one of the most important storage pests of beans including mung bean. In this research, the possibility of using different frequency and priods microwave to control the insect was examined. In this experiment the three stageg of the pest exrosed to frequency of 2450MHz, 200W in periods of 15, 30, 60, 120, 240 and 360 seconds. The results showed that frequency and the time needed to avoid hatching eggs, pupae phase control and inducing adult mortalitywas 200W and 360 secods. In all experiments the mortality rate increased with increas time. According to the results 92.2% mortality of pupae and 96.02% were occurred at 200W and 360s. Also, the results showed that eggs are the most sensitive compase to other stages such a way that 96.11% of mortality occurred at 300W, and duration of 240s, and 200 and 360s. There fore it is recommended 200W and 360s to control all stages of the pest.