4-Methylnonan-5-ol is a core component of the aggregation pheromone of the Western pine beetle (Dendroctonus brevicomis) and also exhibits significant attractant activity towards the Red palm weevil and Sugarcane weevil. In forestry and crop protection, this compound is formulated into specialized lures used in conjunction with traps to mass trap and kill the adults of these wood-boring pests, disrupting their collective aggregation and reproductive behaviors. This green control technology is a key method for the sustainable management of pests in forests, palm plantations, and sugarcane fields, playing a vital role in protecting forest health and agricultural economic interests.