()-trans-Chrysanthemic acid is primarily used as a key intermediate in the synthesis of pyrethroids, a class of synthetic insecticides. These insecticides are widely applied in agriculture to protect crops from pests, in public health to control disease-carrying insects like mosquitoes, and in household products such as sprays and mosquito coils. Its structural properties make it effective in creating compounds that are toxic to insects but have low toxicity to mammals, ensuring safer use in various environments. Additionally, it contributes to the development of products with enhanced stability and efficacy, making it a valuable component in pest management strategies.