Oscillation of continuous and discrete diffusive delay Nicholson's blowflies models

In this paper, we consider the continuous and the discrete delay diffusive Nicholson's Blowflies models with different types of boundary conditions. Our aim is to give some sufficient conditions for oscillation of all positive solutions about the positive steady state. We show that these conditions have essentially first order character by reducing the problem of oscillation of the boundary value problem to that of first order delay differential or difference equation.