Youssef Rouphael is an Associate Professor at the University of Naples Federico II, Italy. He is Editor-in-Chief of Agronomy MDPI and has been a guest editor on biostimulants in several International Journals (Scientia Horticulturae, Frontiers in Plant Science and Agronomy MDPI). He is a member of the scientific committee of Biostimulant.com. He is internationally-known for his research in horticultural science. Giuseppe Colla is Professor of Vegetable Production, Floriculture and Greenhouse Crop Management at the University of Tuscia, Italy. A member of the editorial boards of several leading journals in horticultural science, Professor Colla has an international reputation for his work on plant nutrition and plant biostimulants. He has coordinated many projects to improve horticultural production. Surendra Dara is the Entomology and Biologicals Advisor with the University of California Cooperative Extension. He has nearly 25 years of experience in IPM and microbial control, working on 17 species of invasive pests and diseases and several endemic species throughout his career. He has authored/co-authored more than 390 scientific and extension articles, which include three co-edited books, four co-edited special issues of journals, 19 book chapters, and 50 peer-reviewed journal articles. He is currently serving on various committees or holding offices at the University of California, Entomological Society of America, and the Association of Applied IPM Ecologists. He publishes two eJournals and is a Subject Editor for the Journal of Economic Entomology.