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item Bowman, Kim

Submitted to: HortScience
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/31/2004
Publication Date: 6/1/2006
Citation: Bowman, K.D., Rouse, R.E. 2006. Us-812 citrus rootstock. HortScience. 41:832-836

Interpretive Summary: Orange, grapefruit, and other citrus trees are propagated by grafting a variety with good fruit onto a second variety that forms the roots and lower trunk of the tree. Rootstock varieties must have strong disease-resistant root systems and have a good influence on the health and productivity of the fruiting variety grafted onto them. In Florida and other U.S. citrus production areas, there is an urgent need for better rootstocks that produce a good crop of high quality fruit under a wide range of challenging disease and soil conditions. US-812 is a new citrus rootstock cultivar that was developed by the U.S. Dept. of Agriculture and has now been made available to the U.S. citrus industry for unrestricted commercial use. US-812 has many good traits, including disease resistance and a favorable influence on citrus tree productivity and fruit quality.

Technical Abstract: US-812 is a new citrus rootstock cultivar developed by the Agricultural Research Service of the U.S. Dept. of Agriculture and released in May 2001. Compared to other citrus rootstock cultivars used in Florida, US-812 is highly productive of good quality fruit on a moderate-sized tree and exhibits tolerance or resistance to citrus tristeza virus and citrus blight. US-812 propagates uniformly from seed (by nucellar polyembryony) and is graft compatible with all scion cultivars examined, including sweet orange (Citrus sinensis [L.] Obsbeck), grapefruit (C. paradisi Macf.), mandarin (C. reticulata Blanco), tangelo (C. reticulata x C. paradisi), and other Citrus hybrids.