The book "Bionomics of Pea Aphid (Acyrthosiphon Pisum Harris) on Highland Legume" provides a comprehensive study of the interactions between the pea aphid and various legumes cultivated in the highland regions of Ethiopia. The research analyzes the preferences and performance of the pea aphid, identifies vulnerable growth stages of the legumes, and examines the flight patterns as well as the seasonal dynamics of the pests. The results show that all tested plant species and varieties were colonized by the pea aphids, with significant differences observed in growth rates and colonization. The study offers valuable insights into pest dynamics and their impact on crop yields, which is of great interest to farmers and researchers.