“1) “”…when cuttings obtained from diseased plants are propagated, some grow into symptomless virus-free plants (Cours, 1951). This phenomenon is referred as `reversion’ (Pacumbaba, 1985), `self-elimination’ (Rossel et al., 1988) or `recovery’ (Fargette et al., 1996) in cassava, and similar behaviour has also been reported with other vegetatively propagated crops including potato.””

2) “”…the ability of plants that are virus-infected to become at least mostly virus-free”””

References

“1) Fondong, V.N., Thresh, J.M., Fauquet, C., 2000. Field experiments in Cameroon on cassava mosaic virus disease and the reversion phenomenon in susceptible and resistant cassava cultivars. International Journal of Pest Management 46, 211–217. https://doi.org/10.1080/096708700415553

2) Gibson, R.W., Kreuze, J.F., 2015. Degeneration in sweetpotato due to viruses, virus-cleaned planting material and reversion: a review. Plant Pathol 64, 1–15. https://doi.org/10.1111/ppa.12273“