This article reports the results of an experiment with trifoliate hybrids introduced in Brazil from the U.S. Horticulture Research Laboratory, Orlando, FL, in 1982. Buds of a nucelar clone of Valencia sweet orange carrying citrus tristeza virus (CTV) were grafted on trifoliate hybrids. The trees were planted on a sandy textured Oxisol in Pirassununga, State of São Paulo, nearby groves showing declínio/blight symptoms, and managed without irrigation. Data collected after nine harvests showed that the use of the hybrid rootstocks citrandarins (Changsha mandarin x English Small trifoliate and Sunki mandarin x Benecke trifoliate), and citrange (Shamouti sweet orange x Mediterranean sweet orange x Christiansen trifoliate) resulted in higher fruits yields and soluble-solid contents per tree. Trees budded on Troyer and Carrizo tetraployds citranges showed the lowest fruit production and soluble solid contents. The Miaray mandarin showed stem pitting symptoms characteristic of CTV, while the Smooth Flat Seville x Swingle citrumelo hybrid was intolerant to CTV. Two trees of Davis A trifoliate and Smooth Flat Seville x Argentina citradia, and one tree of Changsha x English Small, and Sunki x Benecke citrandarins, Siamese pummelo x Gotha-road trifoliate, Morton citrange and Troyer tetraployd citrange trees showed declínio/blight symptoms.