Alder yellows phytoplasma
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Alder yellows phytoplasma (AldY)
This phytoplasma belongs to the 16SrV-C subgroup and infects alder trees (Alnus). It is transmitted by the monophagous leafhopper Oncopsis alni. In Europe, black alder (Alnus glutinosa) is frequently infected by this phytoplasma. However, the infections are often mild without the appearance of symptoms (Holz et al. 2016). Only in about 20% of the infections are symptoms visible like yellowing, die-back of branches, reduced foliage, small leaves or tree decline.