Troyer Citrange

This variety originated as a hybrid of the Washington navel orange crossed with trifoliate orange pollen (hence is actually a citruvel) that was made by E. M. Savage, under the direction of W. T. Swingle of the U.S. Department of Agriculture, at Riverside, California, in 1909. In 1934, Swingle named it for A. M. Troyer, on whose place at Fairhope, Alabama, it was first fruited.^⁠[1]

Fruit small, oblate to spherical; smooth and nearly glabrous; color light orange. Rind medium-thick, with numerous oil glands; tightly adherent. Segments 9 to 10 and axis solid. Flesh color light yellow; juicy; flavor strongly acid and bitter. Seeds numerous, plump, and highly polyembryonic. Season of maturity early.^⁠[1]

Tree vigorous, upright-spreading, and medium-large with rather slender, thorny branchlets; foliage moderately dense, evergreen to semi-evergreen. Leaves dark green, medium in size, and mainly trifoliolate, occasionally unifoliolate. Productive and hardy.^⁠[1]

Historical California trials reported greater vigor and slightly larger fruit for Campbell Valencia on Troyer in a 1944 Riverside planting. A 1945 Fillmore planting reported more, larger and slightly better-quality Valencia fruit on Troyer than on sweet or sour orange. These results concern the grafted scions at those sites. A 1955 report described serious bud-union and rootstock disorders in Eureka lemon selections grafted onto Troyer, first observed in Ventura County in 1954; the cause was still undetermined.^{⁠[6]⁠[10]}