Emaravirus Emaravirus Emaravirus is a genus of plant viruses. The genus has more than six species, including: "European mountain ash ringspot-associated virus" (type species), "Fig mosaic virus", "Pigeonpea sterility mosaic virus", "Raspberry leaf blotch virus", "Rose rosette virus" and Maize red stripe virus. "European mountain ash ringspot-associated virus" is associated with a leaf mottling and ringspot disease of European mountain ash "Sorbus aucuparia". It can be transmitted by grafting and possibly mites. The virion particle is between 80-100 nm and consists of an enveloped ribonucleocapsid that exhibits helical symmetry. The genomes are segmented, consisting of four strands of negative-sense single-stranded RNA.
Sorbus aucuparia in an alternate leaf pattern on a branch., distinguishing them from those of ash, "Fraxinus excelsior", which are opposite and without stipules. The leaflets are elongated-lanceolate in shape, 2 to 6 cm long, and 1 to 2.5 cm wide with a sharply serrated edge, and have short stems or sit close to the central vein except for the outermost leaflet. Leaflets are covered in gray-silvery hairs after sprouting but become mostly bare after they unfold. Their uppers side is dark green and their underside is a grayish green and felted. Young leaflets smell like marzipan when brayed. The leaflets are