Citrus trees are best grown in warm to hot climates, with mild winters. Some varieties of citrus, however, can be successfully grown in colder climates, including this grapefruit variety, "Wheeney."
The above photo shows a viral infection, with symptoms of yellow mottling on leaves and puckering, although this could be also due to a combination of frost and wind damage. Viral infections in citrus are untreatable and like with all other viral infections, prevention by buying specimens propagated from virus-tested and/or more resistant material is the key.
Ref : Judy McMaugh, pg. 73-4
The cultivar 'Wheeney' is notorious for this disorder.
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