Modeling the Population Dynamics of Fungal Invaders

Figure 1: Diagram of progress of a single lesion through a potato leaf. The actual furthest location of hyphae in the lesion, denoted as the dashed circle, is invisible. The edge of the visible lesion is the sporulating area, indicated above between heavy solid circles, which emerges from the leaf surface five days after infection by hyphae and produces sporulating bodies. In the radial region behind the sporulating area the lesion has used up all leaf resources, leaving a visible necrotic lesion. A typical maximul daily growth rate for a late blight lesion is 4 millimeters per day.