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And "what we think of as mandarins now actually include a lot of things and they have some pummelo genes," Kahn says.

Long live the Fraud plum, the Golden Gate strawberry, the Memory grape, the Chinese Shaddock pummelo, the Wagner avocado, the Paradise banana, the Dancy tangerine and the Lisbon lime.

It is now believed to be an accidental hybrid of the pummelo, the largest citrus fruit, and the orange.

It showed up first in a Hacienda Heights backyard, on a pummelo branch derived from budwood that had been smuggled from China, where the disease is epidemic.

And Oroblanco, a cross between a pummelo and a grapefruit, is sweeter and less tart than most grapefruit.