marginal significancep = 0.079
While Shannon and Faith's PD indices did not differ significantly among groups (Kruskal–Wallis, p = 0.670 and p = 0.177, respectively), Observed richness was higher in the less restrictive site (CA), particularly among asymptomatic trees, with marginal significance (Kruskal–Wallis χ 2 = 5.07, df = 2, p = 0.079).