Lettuce infectious yellows virus

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Lettuce infectious yellows virus
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LIYV on a Lettuce
Scientific Classification
Family: Closteroviridae
Genus: Crinivirus
Species: Lettuce infectious yellows virus

Lettuce infectious yellows virus (LIYV) of lettuce, cucurbits, and other vegetable crops was first recognized as a distinct viral pathogen in the Southwestern USA.[1] and Mexico[2] in the early 1980's, associated with increases in populations of sweet potato whitefly.[3]

Symptoms[edit | edit source]

Leaves show yellowing and/or reddening between veins and stunting of affected plants. Chlorosis of leaves may develop into brittleness.[4]

Lettuce[edit | edit source]

Compact lettuce heads fail to develop.

Cucurbits[edit | edit source]

In cucurbits, a splotchy mottle or interveinal chlorosis develops on mature leaves. This may be accompanied by vein-clearing, mild mosaic, subtle curling of the tips of young leaves, and a leathery texture in older leaves. Plants are stunted, exhibit poor fruit set and/or incomplete fruit development[4]. Symptoms may appear as early as 3 weeks after plants emerge[5] or 10-12 days after inoculation.

Gallery[edit | edit source]

References[edit | edit source]


  1. Duffus, J.E. Mayhew, D.E. and Flock, R.A. (1982). A new whitefly transmitted virus of the desert Southwest (abst.). Phytopathology 72:963.
  2. Brown, J.K. and Poulos, B.T. (1989). Detection of lettuce infectious yellows virus in greenhouse and field inoculated plants using an indirect enzyme-linked immunosorbent assay. J. Rio Grande Valley Hon. Soc. 2:13-18.
  3. Brown, L.G. Brown, J.K. and Tsai, J.H. (1990). Lettuce Infectious Yellows Virus. Plant Pathology Circular No. 335. Fla. Dept. Agric. & Consumer Serv, Division of Plant Industry.
  4. a b Brown, J.K., and Nelson, M.R. (1986.) Whitefly-borne viruses of melons and lettuce in Arizona. Phytopathology 76:236-239.
  5. Ray, D.T. McCreight, J.D. McGrady, J.J. and Brown, J. K. Resistance in cultivated and wild lettuce to lettuce infectious yellows virus. College of Agriculture Vegetable Rept., Series P-78. Coop. Ext. Serv./Agric. Expt. Stn., Univ. of Arizona, Tucson. 115 pp.