Trifoliata rootstock is resistant to citrus nematode and some species of phytophthora. It grows well on heavier clay loams to loamy soils in the cooler areas. Fruit quality is excellent when used under oranges and some mandarins. Best all purpose stock for orchardists and home gardeners.
Hybrid of Scarlet mandarin and trifoliate orange (P. trifoliata) bred by NSW Agriculture. It was released in 1995 and is compatible with Eureka lemon. Cox is resistant to phytophthora root and collar rot. Seedlings are moderately vigorous and easier to grow than Benton citrange, making it more nursery-friendly.
Troyer is suitable for citrus varieties on good, well-drained soils but are slow to establish in sandy soils where they are inclined to suffer from trace element deficiencies. They have good tolerance to nematodes and phytophthora root rot but do not thrive on alkaline soils.
Citrus rootstock used to dwarf the variety grafted onto it. It is a mutated Trifoliatia species which has hooked thorns and much slower growing. Due to the difficulty and slowness in growing Flying Dragon, Citrus varieties grafted onto this variety are usually more expensive. It imparts the same characteristics to the scion, including cold hardiness, tolerance to root fungi and nematodes. The bitter fruits can be used in marmalades and marinades.