Cauliflower (Brassica oleracea var. botrytis) is an economically and nutritionally important vegetable crop grown worldwide. However, its production is severely threatened by the diamondback moth (Plutella xylostella L.), one of the most destructive pests of cruciferous crops. This highly adaptable and prolific pest causes significant yield losses by feeding on leaves and damaging curds, ultimately reducing market value. Effective management of the diamondback moth in cauliflower requires an integrated approach that combines insecticidal control with sustainable agricultural practices. In addition to suppressing pest populations, it is crucial to consider the dissipation and decontamination of insecticides to minimize environmental residues and ensure food safety. Strategies that enhance the breakdown of pesticide residues while maintaining efficacy can help safeguard beneficial organisms, promote ecological balance, and meet regulatory standards. This book explores innovative and sustainable pest control methods, emphasizing responsible insecticide use, residue management, and decontamination techniques to protect both crops and the environment.