Sweetpotato feathery mottle virus

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Acronym: SPFMV


Synonyms: Sweetpotato chlorotic leaf spot virus; Sweetpotato internal cork virus; Sweetpotato russet crack virus; Sweetpotato vein mosaic virus; Sweetpotato virus A; Sweetpotato vein clearing virus; Sweetpotato ring spot virus


Yellowing of leaf veins (vein clearing) may be accompanied by distortion or puckering  (S. Fuentes & L. Salazar).


Chlorotic spots with purple rings, and purple edged vein feathering (J. O'Sullivan).


Diagnostic summary

  • What you see on plants

- on mature leaves, faint to distinct, scattered chlorotic spots, which may be bordered by purplish pigment in some cultivars.


- classic irregular chlorotic patterns (feathering) along main veins with or without purple margins occur in some cultivars. 


- Increased stress can lead to symptom expression, whereas rapid growth may result in symptom remission.


- on storage roots, the common strain causes no symptom on any cultivar, but the “russet crack” and “internal cork” strains cause external and internal necrotic lesions on certain varieties, respectively.

  • Symptom visibility on foliage is influenced by cultivar susceptibility, degree of stress, growth stage, and virus strain virulence.

  • Found wherever sweetpotatoes are grown.

  • Found with sweetpotato chlorotic stunt virus (SPCSV) in several countries; the combination usually results in a severe disease known as sweetpotato virus disease (SPVD).

  • Transmitted by a number of aphid species.


Economic importance

Geographical distribution




Host range



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