Authors : Orouj Valizadegan, Ali Asghr Pourmirza and Mohammad Hassan Safaralizadeh
Abstract: The impact of microwave irradiation and cold storage against adults of cigarette beetle, Lasioderma serricorne (F.), over various exposure times and cold storage periods was evaluated. The insects were exposed to 2450 MHz at 5 different power levels of 0, 100, 200, 300 and 400 W for 5 exposure times of 0, 3, 6, 9 and 12 min. A complete mortality was achieved for tested insect at 400 W power levels for exposure time of 12 min and 72 h cold storage period. In all experiments, a direct positive relationship between mortality rates and microwaves irradiation power level was obtained. For instance at 100, 200, 300 and 400 W power levels and 24 h cold storage for 3 min exposure period, the mortality rates were 40, 50, 55 and 72%, respectively. Similar trend was obtained for LT50 values. Considerable variation in the susceptibility of tested insect to microwaves power levels and cold storage periods was apparent in the fiducial limits of the LD50 values. In the Analysis of Variance (ANOVA), the R2 value revealed that 90.8% of variability in the susceptibility of L. serricorne could be explained by the microwaves power, cold storage period and exposure duration. Combinations of microwaves irradiation and cold storage were found highly compatible and synergistic. This was more significant for the insects, which were exposed to the highest level of microwaves irradiation and cold storage period. Synergistic interaction indicates that microwaves irradiation can be used with cold storage for management of L. serricorne populations. This treatment could provide an effective and friendly environmental treatment technique in IPM program.
Orouj Valizadegan, Ali Asghr Pourmirza and Mohammad Hassan Safaralizadeh, 2009. The Impact of Microwave Irradiation and Cold Storage on Lasioderma serricorne (F.) (Col. Anobiidae). Research Journal of Biological Sciences, 4: 697-702.