Plant Diseases and Biosecurity – Paul Beales

Written primarily for 16‑19‑year‑old students, this primer aims to extend students’ knowledge and inspire them to take their school‑level learning further. It explores topics familiar from the curriculum and also introduces new ideas, giving students a first taste of the study of biology beyond school‑level and demonstrating how concepts frequently encountered at school are relevant to and applied in current research. It is the ideal text to support students who are considering the transition from studying biology at school to university.

For many years, much of the human population has lived in ignorance of plant disease—yet the presence or absence of disease in a crop or a forest can mean the difference between economic success or disaster, and—even in the 21st century—the difference between life and death for millions of people. This primer raises the profile of plant infectious diseases, highlighting the scale of the problem, the risks to biosecurity, and the scientific advances impacting surveillance, diagnosis, and prevention. It opens with an overview of the importance of plant disease in human history, then reviews the structure and function of the main types of pathogens (bacteria, viruses, fungi, and fungi‑like pathogens), focusing on unusual and interesting examples.

The text explains how plant diseases can be accurately diagnosed using the latest molecular analyses as well as cultural and serological techniques. It examines disease surveillance—still reliant on traditional human observation—and emerging approaches such as epidemiological models, remote monitoring, air‑ and water‑based detection, satellite tracking, and genetic modification of crops. Disease management strategies, ranging from chemical control of insect, fungal, and bacterial pests to genetic modification for disease resistance, are discussed. The final section explores plant biosecurity and how it can be maintained—an increasingly important issue given globalised trade—and the impact of global warming on the distribution of plants and their pathogens.

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