Effect of Temperature Gradient of Grain Storage on Migration and Distribution of Three Pests

Temperature gradients were set at the opposite sides of grain storage: 25°C-30°C, 20°C-30°C, 20°C-35°C, 30°C-30°C. The migration and distribution imago Sitophilus oryzae, Rhizopertha dominica Tribolium castaneum in storage observed. results showed significant differences that trends within a certain temperature gradient (p < 0.05). is 25°C-30°C. tends to gather 30°C side area storage, while oryzae has no obvious trend, 25°C. 20°C-30°C. Both tend 20°C. 20°C-35°C. castaneum, all on 35°C. 30°C-30°C, there trend for castaneum. left right storage. After cooling down, it was found tended center had peripheral