Rice leaffolder moths use a specific set of enzymes to craft their sex pheromones, and we finally have the genetic blueprint to copy them.
April 29, 2026
Original Paper
Integrative Transcriptomic and Functional Analysis Reveals Fatty Acyl Elongases Involved in Sex Pheromone Biosynthesis in Rice Leaffolder, Cnaphalocrocis medinalis (Lepidoptera: Pyraloidea)
SSRN · 6665789
The Takeaway
Farmers have struggled for years to control the rice leaffolder moth, a pest that destroys crops across Asia. Scientists have identified the exact fatty acid enzymes that the moth uses to create the chemical signals it uses to find mates. By mapping these genes, it becomes possible to engineer plants or bacteria to produce these identical pheromones on their own. This would allow farmers to confuse the moths and prevent them from breeding without ever spraying a drop of insecticide. This discovery provides a roadmap for biological pest control that is completely species specific and environmentally friendly. It is the first time we have cracked the code for this specific moth's chemical language.
From the abstract
Elongases are essential enzymes in the biosynthesis of sex pheromones in many lepidopteran species. Together with desaturases, they determine the carbon skeletons of many pheromone precursors, thereby contributing to the production of species-specific chemical signals. However, to date, such fatty acyl elongase gene has not been functionally characterized. The rice leaffolder, Cnaphalocrocis medinalis, utilizes a blend of C18 monounsaturated aldehydes and alcohols as its sex pheromone, implying