| Author(s) | A. M. Assiry |
| Affiliation | Agricultural Engineering Department, Collage of Agriculture, King Saud University, Riyadh, Saudi Arabia |
| Title | Destruction Kinetics of Adult and Larva Stages of Silvanidae Insects by Direct Exposure to Heat Stress |
| Source | Journal of King Saud University. Agricultural Sciences. Volume 16, No 2. (2004/1424) |
| Abstract | The goal of this study was to investigate the thermal stress as a method to control insects that attack palm date. In specific, it was to study the thermal stress on the kinetics of destruction of adult and larva stages of Oryzaephilus surinamensis: Silvanidae insects by direct exposure to hot solution of 0.0, 0.01, 0.5, and 1.0% NaCl for the adult stage, and 0.0% NaCl for larva stage. The temperature levels were 45, 50 and 55 oC. ñResults reveal that zero order kinetic model can describe the destruction successfully in both stages. Adult stage was more resistant to heat stress than larva stage. The killing rate constants at 0.0% NaCl for the adult stage were 0.0109, 0.1012 and 0.9143 sec-1 at 45, 50 and 55 oC respectively. On the other hand, the killing rate constants for the larva stage at the same concentration of NaCl were 0.0358, 0.1433 and 1.0357 sec-1 at 45, 50 and 55oC respectively. Arrhenuis relation can be applied to describe the effect of temperature. Both stages were sensitive to temperature changes where the activation energy approached 3105 [KJ/kg.mole]. Increasing the NaCl concentration resulted in a higher killing rate at 55oC; however, at 50 and 45oC, there was no significant effect of salt concentration on the rate constant for destruction. |
