Permanence and global attractivity of a delayed periodic logistic equation

In this paper, we consider the delayed periodic logistic equationN˙(t)=N(t)[a(t)-b(t)Np(t-σ(t))-c(t)Nq(t-τ(t))],which describes the evolution of a single species. Sufficient conditions which guarantee the permanence and the globally attractivity of the system are obtained.