Insects, pests and weeds are responsible for substantial loss of crops and reduced food supplies, poorer quality of agricultural products, economic hardship for growers and processor. Generally, chemical control methods are neither always economical nor are they effective and may have associated unwanted health, safety and environmental risks. Biological control involves use of beneficial biological agents to control pests and offers an environmental friendly approach to the effective management of plant diseases and weeds. The chapters are written by well recognized group leaders in the field. This book provides a comprehensive account of interaction of host and pests, and development of biological control agents for practical applications in crops management utilizing inherent defence mechanism, induced stimulation and biological control agents. The contents are divided into the following sections: General biology of plant defence, Use of natural compounds for biological control, Use of biological agents, Mechanism of action and Commercial aspects. The book will be useful for academicians, researcher and industries involved in study and manufacturing these products.

I. Biology of Plant defence

1.Plant defense in biological pest control
2. Specialized metabolites and plant defence
3.Sources of variation in defensive traits in Quercus species
4.Glycans as Modulators of Plant Defense
5.Biological Control and Need of a Strategic Shift
II. Use of natural compounds
6.Polyphenolic Compounds Obtained from OMWW
7.small molecules of natural origin
8.Pinus  polyphenols and antifungal activities
9.stilbenoid-enriched grape cane extracts in biocontrol
III. Use of biological agents
10.Biological control of postharvest diseases
11.Sorghum allelopathy for sustainable weed management
12.Chaetomium as biocontrol agent on plant pathogens
13.Fusaria strains as biocontrol agents
14. Fungi as biological control -parasitic nematodes
15.Control of pepper powdery mildew
16.Molecular Mechanisms of Nematode- Microbe Interactions
VI. Market and commercialization
17.Trends for commercialization of Biocontrol Agent.