Title : Citrus Rootstocks
Visit Count : 1252 Time(s)
Upload Date : 3/14/2016 - 2 Year(s) ago
Category : citrus
Monday, March 14, 2016
Visit Count : 1252 Time(s)
Upload Date : 3/14/2016 - 2 Year(s) ago
Category : citrus
Poncirus (P. trifoliata): The Poncirus parentage invariably results in some degree of cold hardiness but also some bitterness in the fruit. The promise of delicious, cold-hardy citrus has not been realised, but these plants survive considerable frost. Highly resistant to Phytophthora, tristeza and citrus nematode. Cold hardy. Intolerant of exocortis. Shallow depth of rooting but develops high fibrous root density. Tree size small to medium. Generally highly fruitful. Fruit quality very good. Incompatible with Eureka lemon and acidless oranges. Compatibility with some minor varieties unknown. Despite accumulating high levels of chloride in leaf tissue does not exhibit obvious toxicity symptoms until leaves drop. Prone to sudden death.
Citranges: Carrizo and Troyer citranges are sibling trifoliate hybrids that are intermediate between sour orange and Swingle citrumelo in terms of vigor, fruit size, total yield and soil adaptability. The citranges are tolerant to tristeza but susceptible to exocortis, citrus nematode and soil alkalinity and exhibit less cold hardiness. Perhaps a third of Valley citrus soils are suitable for the citranges, but their use has been very limited. Incompatible with Eureka lemon. Very prone to micronutrient deficiencies, especially on calcareous soils. Compatibility with some minor varieties unknown. Prone to sudden death.
Cleopatra mandarin, or Cleo, is generally adapted to Valley conditions. It is more cold tolerant than sour orange and tolerant to tristeza, but is less tolerant to alkalinity. Trees on Cleo are slower to bear and yields, fruit size and quality are all poorer than those obtained on sour orange. Cleo is not being propagated currently. Tendency to small fruit size. Good drainage and precautions against root rot essential. Slow to come into bearing.
Swingle citrumelo is a trifoliate hybrid that reportedly equals or exceeds sour orange in most characteristics. It is resistant to nematodes and Phytophthora, tolerant to tristeza and produces a vigorous tree with excellent yields and excellent fruit size. It is reported as tolerant to xyloporosis and exocortis, but some stunting has been observed with old-line budwood having those viruses. Swingle citrumelo is intolerant of poor drainage and exhibits severe chlorosis in heavy soils, so it should be limited to well-drained, very deep sandy soils. An estimated 15 percent of Valley citrus soils are suitable for Swingle citrumelo but very few orchards are planted on this rootstock. Has tolerance to water logging. Incompatible with Eureka lemon and some orange and mandarin cultivars. Overgrows orange varieties. Fruit more prone to creasing than Rough lemon.
Sweet orange: Very susceptible to Phytophthoraroot and collar rots; susceptible to citrus nematode. Tristeza and exocortis tolerant. Mycorrhizal dependent. Intermediate depth of rooting. On well-drained soils in inland areas produces large trees. High yielding with good fruit quality.
Cleopatra mandarin: Moderately susceptible to Phytophthoraroot and collar rots. Tristeza and exocortis tolerant. Susceptible to citrus nematode. Intermediate depth of rooting; intensive fibrous root development. Slow growing in nursery, mature trees large. Early production poor, satisfactory in mature trees. Good fruit quality but small fruit size with some cultivars.
Rough lemon (citronelle): Susceptible to Phytophthoraroot and collar rots, citrus nematode. Tristeza and exocortis tolerant. Mycorrhizal dependent. Extensive lateral and vertical root development. Highly drought tolerant. Produces large trees. Yields are high, of good fruit size, but poor quality. Promotes early maturity. Does not tolerate poorly drained soils. Tendency to accumulate excessive chloride leading to leaf drop. Unsuitable for some mandarins eg. Satsuma and Ellendale tangor.
1. http://aggie-horticulture.tamu.edu/citrus/cultivars/L2304.htm
2. https://www.agric.wa.gov.au/autumn/citrus-rootstocks-western-australia
3. http://www.homecitrusgrowers.co.uk/citranges/citranges.html
4.http://www.dpi.nsw.gov.au/agriculture/horticulture/citrus/lemon-manual.5aRootstocks:Introduction, characteristics and compatability

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