Figure 4.

Known host breadth of pests affects the likelihood that plants will share a pest. Effect of known number of host genera attacked by a fungal pathogen on the phylogenetic signal in the probability that a pest or pathogen from a source host also attacks a target host. Curves are predicted from the logistic regression with coefficients given in Table 2 for phylogenetic distance between hosts and the number of hosts known for a particular pathogen (shown as numbers to the left of each curve). Curves for all nine groups of pest and pathogens take a similar form and are shown in Fig. S6.