“…Microorganisms are receiving increasing appreciation as a way to improve pest control strategies (Trienens & Beukeboom, 2019). This issue contains two contributions from Koskinioti et al (2020a, 2020b) on the role of microbiota, added as probiotics to the diet, in the rearing of the olive fly, Bactrocera oleae (Rossi) (Diptera: Tephritidae), and its parasitoid Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae).…”