Lemon on troyer citrange root: Bud-union and rootstock disorder of Troyer citrange with Eureka lemon tops under study in effort to identify cause

Abstract

A serious disorder in trees of Eureka lemon on Troyer citrange—a hybrid of the trifoliate orange and the navel orange—rootstock was discovered in 1954 when all the Eureka tops in one of the experimental plots in Ventura County turned yellow, set a heavy crop of fruit, and declined markedly.