This book presents the Global Action for Fall Armyworm Control, FAO's new initiative aimed at mobilizing USD 500 million from 2020 to 2022, for radical, direct and coordinated measures to strengthen monitoring and pest control capacities at global level. The initiative aims to improve food security and the livelihoods of millions of smallholder farmers, and reduce environmental pollution through sustainable management and control of Fall armyworm.Fall armyworm, or Spodoptera frugiperda, is a plant pest originating in the tropical and subtropical regions of the Americas. Over the last few years, it has rapidly spread around Africa, Asia and, most recently, Oceania. Concerted action is essential to prevent this pest from threatening the food security and livelihoods of millions of smallholder farmers.The Global Action will ensure a strong, coordinated approach at country, regional and global levels to massively scale up current worldwide efforts through multiple mechanisms, such as Farmer Field Schools, partnerships with research institutions and the private sector, South-South Cooperation, regional and national plant protection organizations, and specific national task forces.