valencia oranges observed on trifoliate rootstocks in this experiment at the Citrus Research Center, Riverside, and Valencia and navel trees in commercial orchards have performed well on this stock for many years; similarly, standard Lisbon lemon varieties have done well on trifoliate rootstock for the 13 years they have been observed. However, a high incidence of the exocortis virus in budwood of Eureka lemon and creasing of the bud union preclude its use on trifoliates or citranges.

Layout of plantings was by M. J. Garber. Po-Ping Wong assisted by budding the rootstocks.