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How to Manage Pests
UC Pest Management Guidelines
Sugarbeet
Whitefly-borne Viruses
Pathogen: Lettuce chlorosis virus (LCV); Lettuce infectious yellows virus (LIYV)
(Reviewed 11/05,
updated 1/10)
In this Guideline:
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Symptoms of these viruses are similar to those caused by
aphid-transmitted Beet yellows virus. Early symptoms are a very mild mottle that
later develop into interveinal yellowing or reddening. Affected plants are
stunted. Vascular rings in roots are brown and mature taproots often appear to
be pithy.
Lettuce infectious yellows used to be a problem on sugarbeets grown
in the Imperial Valley. It was transmitted by the sweetpotato
whitefly, Bemisia tabaci, which has been displaced by the silverleaf
whitefly, Bemisia argentifolii (aka B. tabaci, Biotype B– a
nonvector of this virus). Currently, lettuce infectious yellows is not a major
concern and has not been observed in the field since the early 1990s. Lettuce
chlorosis virus is not uncommon
in the Imperial Valley, but it has not been associated with yield loss in
sugarbeet.
Lettuce infectious yellows is no longer a field problem in
sugarbeets, and controls are not deemed necessary for lettuce chlorosis.
UC IPM Pest Management Guidelines: Sugarbeet
UC ANR Publication 3469
Diseases
S. Kaffka, Agronomy
and Range Science, UC Davis
C. A. Frate, UC Cooperative Extension, Tulare Co.
T. A. Turini, UC Cooperative Extension, Imperial Co.
W. M. Wintermantel, USDA-ARS, Salinas
Acknowledgement for contributions to Diseases:
R. T. Lewellen, USDA, Salinas
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