Fig. 4From: Widespread occurrence of ‘Candidatus Phytoplasma ulmi’ in elm species in GermanyOverall infection rate of elm species at different altitude levels. Altitude, number of sites and number of individuals examined indicated. Left (light grey), percentage of sites with non-infected trees. In a clockwise direction, percentage of sites with up to one-third, more than one-third and up to two-thirds and more than two-thirds of individuals infected by ‘Ca. P. ulmi’Back to article page