Abstract
Temperature gradients were set at the opposite sides of the grain storage: 25°C-30°C, 20°C-30°C, 20°C-35°C, 30°C-30°C. The migration and distribution of imago of Sitophilus oryzae, Rhizopertha dominica and Tribolium castaneum in the grain storage were observed. The results showed significant differences that the distribution trends of imago of Sitophilus oryzae, Rhizopertha dominica and Tribolium castaneum within a certain grain storage temperature gradient (p < 0.05). The temperature gradient of grain storage is 25°C-30°C. Tribolium castaneum tends to gather in the 30°C side area of grain storage, while Sitophilus oryzae has no obvious trend, while Rhizopertha dominica tends to gather in the 25°C. The temperature gradient of grain storage is 20°C-30°C. Both Tribolium castaneum and Sitophilus oryzae tend to gather in the 30°C side area of grain storage, while Rhizopertha dominica tends to gather in the 20°C. The temperature gradient of grain storage is 20°C-35°C. Tribolium castaneum, Sitophilus oryzae and Rhizopertha dominica all tend to gather in the area on the side of grain storage at 35°C. The temperature gradient of grain storage is 30°C-30°C, and there is no obvious trend for Tribolium castaneum. Rhizopertha dominica tends to gather in the 30°C area on the left side of grain storage, while Sitophilus oryzae tends to gather in the 30°C area on the right side of grain storage. After cooling down, it was found that Sitophilus oryzae tended to gather in the center of the grain storage, while the Tribolium castaneum had no obvious trend, and the Rhizopertha dominica tended to gather in the peripheral area of the grain storage.
Highlights
Tribolium castaneum (Herbst) belongs to Coleoptera (Tenebrionidae) and is a worldwide distribution of stored grain pests [1,2]
The results showed that when the temperature range was 20°C-30°C, the bark Rhizopertha dominica tended to gather in areas with lower grain temperature, while when the grain temperature gradient was 30°C-30°C, the bark Rhizopertha dominica showed certain randomness and aggregation, while when the grain temperature was higher than 30°C, they tended to gather in areas with higher grain temperature
The distribution trends of Sitophilus oryzae, Rhizopertha dominica and Tribolium castaneum in a certain grain storage temperature gradient showed significant differences (p < 0.05)
Summary
Tribolium castaneum (Herbst) belongs to Coleoptera (Tenebrionidae) and is a worldwide distribution of stored grain pests [1,2]. It has a distribution of at least 23 provinces (regions) in China [3]. Adult Tribolium Castaneae has stinky glands in its body, which can secrete stinky liquid to cause flour pollution and caking It has peculiar smell and cannot be eaten, resulting in serious deterioration of grain quality and loss of quality. Sitophilus oryzea (Linnaeus) belongs to Coleoptera Curculionidae, which often occurs in temperate and tropical regions. Rhizopertha dominica (Fabricius) belongs to Coleoptera bostrichidae, which is mainly distributed in tropical and subtropical regions.
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