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World of CitrusWorld of CitrusImproved Meyer Lemon
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc3737 (opens in a new tab)
Accessed
California Department of Food and Agriculture · 2018-03-27
https://pi.cdfa.ca.gov/pqm/manual/pdf/404.pdf (opens in a new tab)
California regulation defines Improved Meyer lemon as Meyer clones designated Citrus Variety Improvement Numbers 319 and 333 that the Director determined free from specified virus or mycoplasma-like infections (§3628(1), p. 4). Its regulatory ‘virus free’ definition is specific to tristeza virus/complexes and recognized testing (§3628(3), p. 4); it does not establish disease resistance, fruit equivalence, or a release date.
Accessed
Kenneth Setzer · Fairchild Tropical Botanic Garden · 2017-11-30
Secondary historical account, originally published in the Miami Herald. It reports that the original Meyer carried tristeza virus, a virus-free tree was nurtured at the University of California, and “by 1975 it was released as the improved version” (line 140). The wording establishes a reported upper-bound year, not an exact release date or a claim of disease resistance.
Accessed
Epic Gardening · YouTube · 2020-02-18
https://www.youtube.com/watch?v=NU8iM4WTC8c (opens in a new tab)
Summary from transcript: The presenter explicitly identifies a newly potted, nursery-supplied Improved Meyer lemon in San Diego, zone 10b (0:12–0:20; 0:39–0:49). Native English captions cover 0:06–10:45. Rootstock, fruit sample, harvest, yield, and measurements are absent. The speaker’s claim that an earlier virus was “bred out” is not used as evidence of disease resistance or breeding history.
Accessed
Plant Lust, LLC
https://plantlust.com/plants/27899/clementine-de-nules-mandarin/ (opens in a new tab)
Incidental Plant Lust recommendation card shown on the supplied Clemenules page; listing guidance only, with no specific specimen, rootstock, site conditions, or measurement method.
Accessed
CHI . The Thirsty Gardener · YouTube · 2023-01-25
https://www.youtube.com/watch?v=sCkeChgjh-M (opens in a new tab)
Summary from transcript: At 5:22–5:29, the presenter reports three lemons from the home Improved Meyer tree that year. Site, rootstock, tree age, and maturity are unstated; this is a tree-specific crop report.
Accessed