Tri-Trophic Level Interactions of Crop (IMAGE) Science China Press Caption This image shows tri-trophic level interactions of crop, pest, and natural enemy. Credit ©Science China Press Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.