4-Oxo-2-hexenal, as an alarm pheromone component of some hemipteran insects (e.g., tea-winged bugs), is released by threatened individuals to warn conspecifics to avoid dangers, and has been developed as a behavioral modifier through synthetic techniques for the repellent system of pests in orchards and farmlands, which can reduce the rate of crop damage by interfering with the aggregation behaviors of pests, and has demonstrated a unique potential for chemical communication interventions in green prevention and control.