PDF Icon View as PDF                                         
Star Ruby


Texas A & I University Citrus Centre, developed by Dr. Dick Hensz in 1959. Irradiated Hudson grapefruit seed. Named and released in 1970. 12 seed imported into South Africa in 1972. The nucellar selection was put through shoot tip grafting, cross protected with the Nartia mild CTV isolate and after evaluation was introduced into the industry.


Commercial Release


Bushy, compact growth that produced fruit with a deep red flesh and rind colour. Produces fruit with an excellent deep red flesh colour. Slightly smaller fruit than other red grapefruit selections. Yields are good. Develops some leaf chlorosis. The Star Ruby makes up a substantial part of the South African grapefruit industry.


Less vigorous and tends to bear more fruit inside the tree. Typically, Star Ruby Grapefruit Fruit is a uniform, large fruit with smooth rind. Fruit shape is round to flat, depending on climate, and fruit rind colour is fairly uniform developing a deep red blush at maturity. Internal flesh colour is a uniform deep red. Star Ruby has very low seed counts. The flavour is good, maturing in mid-April to mid-May in suitable areas. The fruit maintains its quality on the tree till mid-June. The majority of fruit vary from 98 to 82 mm (counts 32 to 56).Susceptible to CTV like other Grape fruit. Harvest disorders are as for other grapefruit.


Suggested rootstocks are Swingle citrumelo and Carrizo/Troyer citrange, depending on soil type and whether plantings are on new or replant ground. Rootstocks inducing lower sugars levels are not advised.
Evaluation Data
Evaluation Images Internal Quality
DateRegionSelectionCountJuice %BrixAcidRatioColour

Count Distribution
Yields of 60 tonnes per hectare are normal for mature orchards. Young trees bear well.
The Star Ruby has for many years been one of the main Grape Fruit selections, comprising 55% of total plantings. Due to its very good internals and deep red flesh colour, it has been popular in most export markets. However supply in recent years has exceeded demand and growers should be careful to ensure shelf space is available before planting new Ha’s.