The book "Allelochemicals: Biological Control of Plant Pathogens and Diseases" offers a comprehensive analysis of the biological control of plant diseases and pathogens, which is of great importance in forestry and agriculture. It highlights the need to discover biologically active natural products from higher plants that serve as an environmentally friendly and health-safe alternative to synthetic agrochemicals. The development of natural products such as herbicides and fungicides is emphasized as a key to reducing environmental and health risks. The book is divided into several sections that address the discovery and development of fungicidal natural products, the direct application of allelochemicals, and their indirect effects through cover crops and organic fertilizers to combat plant-parasitic pests. Additionally, the application of allelopathy in integrated pest management is discussed.