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|Hybrid parentage||Poncirus trifoliata (Japanese bitter orange) x Citrus × paradisi (grapefruit)|
Citrumelo or Citromelo (X Citroncirus spp.) is also called Swingle citrumelo trifoliate hybrid, because it is a cold hardy citrus hybrid between a 'Duncan' grapefruit and a trifoliate orange (Poncirus trifoliata (L.) Raf.), developed by Walter Tennyson Swingle.
Citrumelo is widely employed as a citrus rootstock, being resistant to the severe citrus tristeza virus and to the Phytophthora foot rot as well as to blight, cold, and citrus nematode. It produces yellow fruit which taste (if added sugar) and smell like an ordinary grapefruit. The trees are very hardy and can survive temperatures as low as 30s (Fahrenheit).
Trifoliate orange, according to Swingle, belongs to a citrus related genera, called Poncirus, while grapefruit equivocally belongs to the genus citrus, hence the botanical name X citroncirus is a hybrid genus, derived from citrus and poncirus.
- ‘Swingle’ citrumelo propagation by cuttings for citrus nursery tree production or inarching. Scientia Horticulturae. April 2009;120(2):207–212. doi:10.1016/j.scienta.2008.11.001.
- Citrumelo by Citrus Variety Collection
- "Citrumelo of Nottingham". homecitrusgrowers.co.uk. Retrieved 17 January 2017.
- "Citrumelo Hardy Grapefruit". onegreenworld.com. Retrieved 17 January 2017.