In order to adapt to the development direction of "green" and "environmental protection" in the grain industry under the new situation, the contact activity and repellent activity of eight plant extracts on red flour beetles and rice weevils were studied. The results showed that citrus essential oil had a strong contact and repellent effect on both insect species. After 72 hours of treatment with citrus essential oil at a dose of about 1.05 μg/cm2, the repelling rate of red flour beetles could reach grade Ⅳ and above and the corrected mortali...