** Embargo: Publication date: 23 July 2026, 8.00 pm CET (2.00 pm US Eastern Time) **Plant diversity has long been regarded as key to stable and resilient ecosystems. The study focused on the question of how plant diversity influences the interactions between plants, herbivorous insects and their natural enemies. *Species-rich fields promote natural pest control*The benefits of greater plant diversity are particularly evident in agricultural landscapes. There, greater plant diversity initially led to higher plant production and a greater food supply for herbivores. At that time, it was demonstrated experimentally for the first time that plant diversity has an impact on entire food chains.