IPM IPM historically developed within Entomology as response to over-reliance and overuse of synthetic insecticides across all crops post-WWIl. Insect management became 'Calendar- based' ❚ IPM historically developed within Entomology as response to over-reliance and overuse of synthetic insecticides across all crops post- WWII. ❚ Insect management became ‘Calendar￾based’ IPM