Modeling the Transmission of Densovirus (HaDNV-1) in the Helicoverpa armigera Population

Densovirus (HaDNV-1) is a mutualistic symbiont of Helicoverpa armigera, and the infected females occupy advantage in vertical transmission. A model of species competition was posed to understand the influence of HaDNV-1. When the damage of HaDNV-1 is neglected, the stability of equilibria was analysed and a conclusion was drawn that the infected is dominant in Helicoverpa armigera population. Considering the harm of HaDNV-1, the model was modified by raising the mortality of the infected adult and larva respectively to indicate the cost; thereby the mortality was evaluated to lead to the infected pests extinct.