How to Manage Pests

UC Pest Management Guidelines


Tobacco Streak

Pathogen: Tobacco streak virus in the ilarvirus group

(Reviewed 12/13, updated 12/13)

In this Guideline:


Downward curling of leaf blades on tomato plants with tobacco streak is common. Leaf veins become necrotic and can lead to necrotic blotches, especially on young leaves. Fruit may develop necrotic ringspots. Necrotic streaks on young stems extend to flowers and leads to flower drop.

Comments on the Disease

Tobacco streak is a widespread disease of tomato, but it generally does not cause major losses. Spread of the virus is associated with pollen and/or thrips (including western flower thrips, Frankliniella occidentalis, and the onion thrips, Thrips tabaci). Seed transmission is reported to occur in some beans, chickpeas, and weeds. The host range for this virus is wide and includes common weeds such as mustards, radishes and thistles.


There is no genetic resistance to tobacco streak in tomatoes and no effective management strategies are available.


[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Tomato
UC ANR Publication 3470


R. M. Davis, Plant Pathology, UC Davis
G. Miyao, UC Cooperative Extension, Solano and Yolo counties
K. V. Subbarao, USDA Agricultural Research Station, Salinas, CA
J. J. Stapleton, UC IPM Program and Kearney Agricultural Center, Parlier
B. J. Aegerter, UC Cooperative Extension, San Joaquin County (powdery mildew on field-grown tomatoes)
Acknowledgments for contributions to Diseases:
B. W. Falk, Plant Pathology, UC Davis

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