"Parasitic weeds from the genus Orobanche considerably damage crop plants due to withdrawal of water, minerals and carbohydrates. The growth of the hosts is retarded and yield losses range from 5 to 100%. The proposed project is dealing with tritrophic aspects of the host-plant selection by the oligophagous fly Phytomyza orobanchia, a natural enemy of Orobanche species. The novel aspect and the ma ...