Fig. 1
From: Widespread occurrence of ‘Candidatus Phytoplasma ulmi’ in elm species in Germany
‘Ca. P. ulmi’-specific disease symptoms. a Branches of a healthy (left) and diseased (right) U. glabra tree in winter time. b Rare witches’ broom formation of U. glabra in summer time. For an overview of trees see Schneider and Kube, 2019 [29]. c Twig of a healthy U. minor with normal leaf size and leaf colouration showing mottle similar to virus infection. dU. minor branch with stunted growth. eU. minor with little leaf symptom and leaf chlorosis. The scale bar represents a length of 8 cm