We consider an interacting particle system in which each site of the d-dimensional integer lattice can be in state 0, 1, or 2. Our aim is to model the spread of disease in certain plant populations, so think of 0 = vacant, 1 = (healthy) plant, 2 = infected plant. A vacant site becomes occupied by a plant at a rate which increases linearly with the number of plants within range R, up to some saturation level, F₁, above which the rate is constant. Similarly, a plant becomes infected at a rate which increases linearly with the number of infected plants within range M, up to some saturation level F₂. An infected plant dies (and the site becomes vacant) at constant rate $\delta$. We discuss coexistence results in one and two dimensions. The results depend on the relative dispersal ranges for plants and disease.