In the system we study, 1's and 0's represent occupied and vacant sites in the contact process with births at rate $λ$ and deaths at rate 1. $-1$'s are sterile individuals that do not reproduce but appear spontaneously on vacant sites at rate $α$ and die at rate $θα$. We show that the system (which is attractive but has no dual) dies out at the critical value and has a nontrivial stationary distribution when it is supercritical. Our most interesting results concern the asymptotics when $α\to 0$. In this regime the process resembles the contact process in a random environment.