UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

SKIP navigation

 

How to Manage Pests

UC Pest Management Guidelines


The stem pith of tomato plants affected with pith necrosis turns dark brown and develops hollow cavities.

Tomato

Tomato Pith Necrosis

Pathogen: Pseudomonas corrugata

(Reviewed 1/07, updated 1/07)

In this Guideline:


SYMPTOMS AND SIGNS

Tomato pith necrosis affects mature tomato plants. Symptoms include a brown discoloration and/or necrosis of the pith, which eventually leads to hollow chambers in the stem. The pith browning usually extends far up the plant. Profuse adventitious roots are associated with the stem where the pith is affected. Gray or dark brown lesions may appear on the surface of the stem. Affected plants may turn chlorotic and wilt.

COMMENTS ON THE DISEASE

Pith necrosis occurs when the first fruit set is close to mature green. High humidity favors its development. The bacterium may be seedborne. In California it is seen primarily in greenhouses, but can occur in fresh market tomato fields in the southern part of the state, and occasionally, but rarely, in Central Valley tomatoes.

MANAGEMENT

Management for tomato pith necrosis is not practiced in California.

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Tomato
UC ANR Publication 3470
Diseases
R. M. Davis, Plant Pathology, UC Davis
G. Miyao, UC Cooperative Extension, Solano/Yolo counties
K. Subbarao, USDA Agricultural Research Station, Salinas
J. J. Stapleton, UC IPM Program, Kearney Agricultural Center, Parlier
Acknowledgments for contributions to the disease section:
B. W. Falk, Plant Pathology, UC Davis


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/r783101911.html revised: April 25, 2014. Contact webmaster.