How to Manage Pests

UC Pest Management Guidelines

Lettuce

Lettuce Chlorosis

Pathogens: Lettuce chlorosis virus

(Reviewed 4/17, updated 4/17)

In this Guideline:


Symptoms AND SIGNS

Leaves of plants infected with lettuce chlorosis virus exhibit severe yellowing, rolling, brittleness, and vein-clearing. Plants infected early are stunted.

COMMENTS ON THE DISEASES

This disease occurs in lettuce grown in the southern deserts of California. Lettuce chlorosis virus has a wide host range.

Lettuce chlorosis virus is transmitted by sweetpotato whitefly (Bemisia tabaci biotype MEAM1). Weed hosts are apparently the major source of lettuce chlorosis and barring any major change in cropping patterns in the desert, the incident of these viruses should remain low.

Management

Reducing whitefly numbers and removing weed sources may reduce this disease; however, specific controls are not generally practiced.

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Lettuce
UC ANR Publication 3450

Diseases

S. T. Koike, UC Cooperative Extension, Monterey County
T. Turini, UC Cooperative Extension, Fresno County

Acknowledgment for contributions to Diseases:
R. M. Davis, Plant Pathology, UC Davis

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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