Cross Made
Walter T. Swingle produced the grapefruit x Poncirus hybrid later known as Swingle citrumelo.
- Walter T. SwingleBreeder
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World of CitrusWorld of CitrusSwingle Citrumelo
Walter T. Swingle produced the grapefruit x Poncirus hybrid later known as Swingle citrumelo.
About four decades after the original cross, USDA programs in Florida and Texas began evaluating Swingle as a rootstock, leading to its later widespread adoption.
The Citrus Rootstocks index lists the USDA release date of Swingle Citrumelo as 1974.
Sources: [23]