This book contains five chapters that detail weevils. Chapter One discusses the current state of knowledge regarding the use of agro-industrial waste to produce the fungal biomass of entomopathogenic fungi, and its use for the biological control of pests, the production of enzymes of industrial interest, and various chemical compounds with high added value. Chapter Two investigates the mobilization of reserves during the embryogenesis of C.maculatus. Chapter Three considers the issue of biocontrol exerted by toxins from various microorganisms on insect species considered important pests for agriculture. Chapter Four conducts a review of pest-weevil growth models to predict and analyze the pests' behavior under different ecological sets of conditions. Lastly, Chapter Five aims to show in a synthesised, clear and precise way the relevant information on the species Sitophilus oryzae to help researchers and decision-makers to better understand this pest.