Seedless Kishu Mandarin

Seedless Kishu (Mukaku Kishu) is described in a chapter excerpt as a mutant of seedy Kishu from Japan. The chapter reports that the seedless trait appears monogenic and dominant; it does not give the mutation’s date or establish that it was spontaneous. UCR records CRC 3906 budwood received from Japan via Glenn Dale in 1983, an accession receipt rather than a mutation date.^⁠[2]⁠[1]

UCR lists December–January ripening at Riverside for CRC 3906. Its reproduced 1967 description concerns Kishu generally; the dated CRC 3906 observations describe very small fruit that peel and section well, with drying and granulation noted at the apical ends in November 1988. David Karp describes Seedless Kishu fruit as smaller than a golf ball, tender and juicy, fragrant, and easy to peel, with a Southern California season from Thanksgiving through January and Ojai about a month later.^⁠[1]⁠[3]

Karp reports Jim Churchill as California’s first commercial planter of Seedless Kishu, with a 780-tree Ojai orchard; Churchill observed that older trees produced smaller fruit, making harvest and sorting more difficult.^⁠[3]