This book presents the work that has immense application in pest-control and will greatly help in offering ecofriendly and economical solution for development of bio-intensive management programme for an invasive mealybug species Phenacoccus solenopsis that devastated Indian cotton economy. In this book, the research work involving the impact of development stage and density of prey/ host insect on the biocontrol potential of natural enemies is illustrated along with identification of key host/ prey stage that contributes considerably towards development and progeny fitness of the parasitoids and predators of the mealybug. The information contained in this book can best be exploited by biological control scientists and integrated pest management practitioners in laboratory mass production of good quality bioagents, a prerequisite for successful biological control of insect pests. We hope, this will serve as a base for future ecofriendly pest management strategies.