General Information: Candidatus Phytoplasma mali strain AT was collected in Heidelberg, Germany from a symptomatic apple tree. Candidatus Phytoplasma mali belongs to a group of mycoplasma-like organisms (Mollicutes) that infect plants and insects. This organism causes the economically significant apple proliferation disease in Europe. This disease is characterized by floral and phloem necrosis, wilting or general plant decline. Candidatus Phytoplasma mali can also infect cherry, apricot and plum trees.