WitchesʹBroom of Rhamnus catharticus: A New Phytoplasma Disease

fK lelha! witchesʹ broom disease of buckthorn {Rhatnuus catharuius) has been observed in south-western Germany. The disease is associated with the presence ofa dislinci phytoplasma ihai is mosl closely related to ihe phyioplasmas oi" the apple proliferation ckisier. However, the agent can clearly be distinguished from ihe other cluster members