Abstract
<jats:p> <jats:italic>Diaphorina citri</jats:italic> is the primary vector of Huanglongbing (HLB), a devastating disease that affects global citrus production. Effective biological control using the parasitoid <jats:italic>Tamarixia radiata</jats:italic> represents a sustainable alternative to chemical insecticides, but its efficacy depends heavily on environmental variables and resource availability. In this work, we develop a four-population mathematical model to analyze the dynamics of <jats:italic>D. citri</jats:italic> in the presence of <jats:italic>T. radiata</jats:italic> , a known parasitoid. Our model incorporates the cyclical and periodic behavior of citrus flushing (new shoots), providing a realistic representation of resource-limited dynamics as observed in field conditions. Through comparative simulations of three scenarios, without parasitoid, a single initial introduction, and periodic augmentative releases, we characterize and compare the impact of <jats:italic>T. radiata</jats:italic> as a biological control agent. Our results show that periodic releases maintain pest suppression, whereas a single introduction only delays pest recovery. By aligning theoretical modeling with ecological reality, this framework supports the role of <jats:italic>T. radiata</jats:italic> in pest suppression and provides a baseline for future work on optimal and cost-effective release strategies. </jats:p>