From September 11 to 12, 2025, the Doctoral Days of the Biotechnical Field were held at the Faculty of Food Technology and Biotechnology, University of Zagreb, organized jointly by the Faculty of Food Technology and Biotechnology, the Faculty of Agriculture, and the Faculty of Forestry and Wood Technology, all constituents of the Biotechnical Field of the University of Zagreb. Within the framework of the event, PhD candidate Luka Čotić (DOK-NPOO-2023-10-7422) presented the research results of the project BeerBy-4-OliveFly (HRZZ-IP-2022-10-9643) by the group of authors Čotić L., Zalom F., Jukić Špika M., Burul F., Bego A., and Vitanović E., entitled “Modification of Two Types of Brewer’s Spent Yeast and Their Effectiveness in Attracting the Olive Fruit Fly (Bactrocera oleae Rossi).”