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Citrumelo 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.〔(Citrumelo ) by Citrus Variety Collection〕 ==Taxonomy==
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Citrumelo」の詳細全文を読む
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