Le pomelo Star Ruby est le résultat de pépins de pomelo Hudson irradiés par le programme de sélection de RA Hensz de la Texas, obtenu en 1977. Le fruit est similaire au Marsh ou Redblush sauf pour la chair rose foncée. C’est le pamplemousse pigmenté le plus foncé . Maturité de février à juin. Vigueur : moyenne. Nom latin « star ruby »
Résiste jusqu’à -7°
The varieties of Texas and Florida grapefruit include: ‘Duncan’, ‘Flame’, ‘Henderson’, ‘Hudson’, ‘Marsh’, ‘Oro Blanco’, ‘Pink’, ‘Pummelo HB’, ‘Ray’, ‘Rio Star’, ‘Ruby Red’, ‘Star Ruby’, ‘Thompson’, ‘Triumph’, ‘Walters’, ‘White Marsh’. Using radiation to trigger mutations, new varieties were developed to retain the red tones that typically faded to pink.
The 1929 ‘Ruby Red’ (or ‘Redblush’) patent was associated with real commercial success, which came after the discovery of a red grapefruit growing on a pink variety. It was a limb sport of a ‘Thompson’ grapefruit selected by A.E. Henninger. The ‘Thompson’ was a limb sport from a ‘Marsh’ grapefruit selected in 1913.
Using radiation to trigger mutations, new varieties were developed to retain the red tones that typically faded to pink. The ‘Rio Red’ variety is a 2007 Texas grapefruit with registered trademarks Rio Star and Ruby-Sweet, also sometimes promoted as Reddest and Texas Choice. The ‘Rio Red’ is a mutation-bred variety that was developed by treatment of bud sticks with thermal neutrons. Its improved attributes of mutant variety are fruit and juice color, deeper red, and wide adaptation.
The ‘Star Ruby’ is the darkest of the red varieties. Developed from an irradiated ‘Hudson’ grapefruit (‘Hudson’ being a limb sport of ‘Foster’, itself a limb sport of the ‘Walters’), it has found limited commercial success because it is more difficult to grow than other varieties.