Prof Viljoen leads an African Consortium dealing with Foc TR4, a plant pathogenic fungus threatening food security on the African continent), and coordinates the African Mycotoxin Network . He led the Global Promusa Fusarium Wilt Working Group from 2003 to 2007, and is currently helping the FAO to establish a Global program on Foc TR4. He organised the International ISHS/ProMusa Symposium on Banana Crop Protection for Sustainable Production and Improved Livelihoods in 2007, served as member of numerous scientific committees and working groups, and acted as keynote speaker at many international conferences worldwide. He serves as consultant on banana Fusarium wilt internationally and was selected a Chinese National Foreigner Expert in 2014. Viljoen is partner of a CGIAR-funded project on maize breeding in Africa, and a BMGF project on banana breeding in Africa. He is also organizer of the first African Mycotoxin Symposium that will be hosted in 2015. Recognitions: membership in national and other academies, prizes, awards, etc. South African Society of Plant Pathology American Phytopathological Society British Society of Plant Pathology International Society of Horticultural Sciences.