In order to obtain specific and sustainable solutions for crop protection, we need a better understanding of the molecular interactions between plants and phytopathogens. Intracellular organelles such as chloroplasts and mitochondria play a pivotal role in plant immune responses. Our team aims to identify pathogen-secreted effector proteins that target the plant host organelles. Together with the identification of the specific target proteins within the host organelles, we aim a better insight at the molecular level into plant-pathogen interactions and the involvement of organelles in plant immunity.