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How to Manage Pests

UC Pest Management Guidelines

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Pythium rot of ripe fruit.

Tomato

Water Mold (Fruit Rot)

Pathogens: Pythium ultimum and other species

(Reviewed 1/07, updated 1/07)

In this Guideline:

SYMPTOMS

Water-soaked lesions develop on ripe fruit in contact with wet soil. Within several days, the entire infected fruit turns into a water bag.

MANAGEMENT

Avoid late-season irrigation, especially when threat of rainfall increases. Avoid wetting the top of beds when fruit is ripening. Shorter furrow irrigation runs and higher beds may lessen risk.

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
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