Evaluation of Trichogramma chilonis Ishii - based green control ffficacy against rice stem borers

Objective Rice stem borers are major pests threatening rice production. Their larvae bore into rice stems, causing symptoms such as dead hearts and white heads, which severely impact both yield and quality. To address this agricultural production challenge, this study investigated the efficacy of green biological control using Trichogramma chilonis against rice borers, aiming to reduce chemical pesticide application and ensure safe rice production.

Method This study focused on the use of unmanned aerial vehicles to submerge and release T. chilonis in the field, supplemented by physical and chemical control such as light and sexual induction, as well as ecological regulation. When the pest reached the control threshold, a comprehensive prevention and control technology system using green pesticides is used to study the effect of green prevention and control on rice stem borers and yield increase.

Result The release of T. chilonis resulted in an 85% reduction in the stem borer population, significantly decreasing the number of rolled leaves and the dead heart rate in silk rice. The green control treatment based on T. chilonis achieved a yield of 6 688.95 kg/hm², compared to 6 073.05 kg/hm² in the conventional chemical pesticide treatment, representing an average increase of 10.14%.

Conclusion The T. chilonis-based green prevention and control can effectively suppress rice stem borer populations, increase the yield of silk rice, and is environmentally friendly, showing strong potential for widespread adoption.