This book presents advanced ecological techniques for crop cultivation and the chapters are arranged into four sections, namely general aspects, weeds, fungi, worms and microbes. Biocontrol is an ecological method of controlling pests such as insects, mites, weeds and plant diseases using other organisms. This practice has been used for centuries. Biocontrol relies on predation, parasitism, herbivory, or other natural mechanisms. Natural enemies of insect pests, also known as biological control agents, include predators, parasitoids, pathogens, and competitors.