Effect of thermal stress on longevity and reproduction of Angoumois grain moth Sitotroga cerealella (Lepidoptera gelechidae) in laboratory Condition

The Angoumois wheat moth (AGM) causes significant loss of grain stored in stores and fights for years. This insect is a major pest of stored grains because its immature stage (caterpillars) develop entirely in the grain core. The attacked kernels are mostly hollow with round holes where the moths emerge. It will weigh about 20% less than the sound kernel. AGM -attacked cereals usually have an unpleasant odor that refuses to eat them or limits their use by humans and animals. So to control these insects different temperatures are used. In this study five different temperatures (15 °C, 20 °C, 25 °C, 30 °C and 35 °C) were used to control Angoumois seed moths under maternity conditions. Results revealed that a maximum incubation period of Sitotroga cereallea eggs was observed on 15 °C temperature (6.34±0.13) and 20 °Ctemperatures (6.01±0.78). While a minimum incubation period of Sitotroga cereallea eggs was observed on 30 °Ctemperature (3.02±0.65). A maximum hatching % of eggs Sitotroga cereallea was observed in 25 °C temperature (91.47±1.02). While a minimum hatching % of eggs Sitotroga cereallea was observed in 15°Ctemperature (70.34±0.13). A maximum larval mortality of Angoumois grain moth, Sitotroga cereallea was observed on 15 °Ctemperature (33.34±0.13). While a minimum larval mortality of Sitotroga cereallea was observed on 30 °C temperature (11.02±0.65). A maximum larval development period of Sitotroga cereallea was observed on 15 °C temperature (23.34±0.13) and 20 °C temperature (22.01±0.78).