General information:

1999 – USDA released ‘US-852’ citrus rootstock, which supports highly productive, medium-sized trees.

2001 – USDA released ‘US-812’ citrus rootstock.  This hybrid rootstock produces healthy medium-size trees with a wide range of scions, and consistently yields large quantities of good quality fruit.  ‘US-812’ also exhibits resistance to citrus blight and has the CTV resistance gene ctvR.

2007 – USDA released ‘US-802’ citrus rootstock.  This hybrid rootstock has field tolerance to the Phytophthora-Diaprepes disease complex, resistance to citrus tristeza virus, and good fruit productivity.  The rootstock ‘US-802’ combines high vigor and large tree size with the other positive attributes.

2007 – USDA released ‘US-897’ citrus rootstock.  This hybrid rootstock has field tolerance to the Phytophthora-Diaprepes disease complex, resistance to citrus tristeza virus, good fruit productivity, and good fruit quality.  The rootstock ‘US-897’ fills a much-needed niche as a dwarfing rootstock well adapted to Florida conditions.

2010 – USDA released ‘US-942’ citrus rootstock.  This semi-dwarfing hybrid rootstock produces healthy small to medium-size trees with a wide range of scions, and consistently yields large quantities of good quality fruit.  ‘US-942’ also exhibits field tolerance to the Phytophthora-Diaprepes disease complex, resistance to citrus blight, and has the CTV resistance gene ctvR.

For additional information, contact kim.bowman@ars.usda.gov.