A Maize Germplasm Is Resistant to Fall Armyworm: From Life Table Analysis to Greenhouse Assays

Abstract

Simple Summary The fall armyworm is a destructive pest that causes major losses to maize crops worldwide. Crop insect resistance has become an important component of pest management. This study investigated whether a maize line called CH1 could naturally resist this pest. We compared the growth, survival, and reproduction of fall armyworm larvae fed on CH1 with those fed on a susceptible maize line, Huang C. The results showed that larvae fed on CH1 developed more slowly, had lower survival rates, and produced fewer offspring. In addition, both the larvae and adult moths strongly preferred Huang C over CH1 for feeding and egg-laying. When tested in a greenhouse, CH1 plants showed only minor damage, while Huang C plants were severely defoliated. These findings demonstrate that CH1 possesses multiple layers of natural resistance against fall armyworm. This maize line could serve as a valuable genetic resource for breeding new varieties with built-in pest resistance, reducing the need for pesticides and supporting more sustainable and environmentally friendly farming practices.