The effect of microwaves radiation and cold storage
against adults of sawtoothed grain beetle, Oryzaephlius surinamensis
(L.) over various exposure times and cold storage period was evaluated.
The insects were exposed to 2450 MHz at five different power levels of
0, 100, 200, 300 and 400 W for five exposure times of 0, 3, 6, 9 and 12
min. A complete mortality was achieved for tested insect at 400 W power
level for exposure time of 12 min and 72 h cold storage period. At a given
time, a direct positive relationship between mortality rates and microwaves
radiation 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 O. surinamensis could be
explained by the microwaves power, cold storage period and exposure duration.
Combinations of microwaves radiation 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 radiation and cold
storage period. Synergistic interaction indicates that microwaves radiation
can be used with cold storage for management of O. surinamensis.
This treatment could provide an effective and friendly environmental treatment
technique in IPM program.
O. Valizadegan, A.A. Pourmirza and M.H. Safaralizadeh, 2009. Combination of Microwaves Radiation and Cold Storage for Control of Oryzaephilus surinamensis (L.) (Col. Silvanidae). Journal of Biological Sciences, 9: 231-236.