IAM Plant Biotech Unit Plant Pathology Webpages

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Apple Stem Grooving Virus (ASGV) ASGV has apple, pear, oriental Pyrus including nashi and some ornamental plants as natural hosts. The virus is quite stable and replicates in the cambium in low titers. ASGV does not cause obvious symptoms in commercial cultivars. Virginia Crab may be used as an indicator plant and develops long grooves on the woody stems. Swelling of the scion stem at the union with the rootstock often occurs. The scion component eventually dies. Leaves are small, pale green, and drop prematurely. Formerly unknown in Europe, ASGV is detected in 75 % of nashi and other pomaceous species imported from Japan and in 25 % of apple trees imported from the USA. The virus could be epidemic, given its frequency, but no vector is known. Nomenclature and Host Range (VIDE database) Sequence Info (NCBI database) Isolates in the Vienna Collection Detection methods