This book describes interactions of plant viruses with hosts and transmission vectors in an agricultural context. Starting with an overview of virus biology, economics and management, chapters then address economically significant plant diseases of tropical and subtropical crops. For each disease, symptoms, distribution, economic impact, causative virus, taxonomy, host range, transmission, diagnostic methods and management strategies are discussed.

In the twenty-first century, governments around the world began to engage the private sector with the objective of achieving public service delivery targets, and the African continent has as such, been experiencing transformation, particularly since the introduction of public-private partnerships (PPP), as a measure of reform and method of procurement. Unfortunately, there is a mixed bag of successes and challenges through this implementation of PPPs, causing a gap in infrastructure, leavi...