How to Manage Pests
UC Pest Management Guidelines
Phytophthora Fruit and Crown Rot
Pathogen: Phytophthora capsici and other species
(Reviewed 11/05, updated 6/08)
In this Guideline:
SYMPTOMS AND SIGNS
Phytophthora fruit and crown rot is most commonly found on squash and pumpkins, but all cucurbits are susceptible. This disease occurs suddenly in a field and plants wilt and die within a few days of infection. Infected fruit rot quickly. The roots and stems are soft, water-soaked, and brown. A downy growth is often apparent on plant lesions during periods of high humidity.
COMMENTS ON THE DISEASE
This disease only occurs where the soil has been moist for an extended period of time. Phytophthora capsici also infects tomatoes and peppers and is found throughout the state.
Good water management is usually sufficient to control this disease. Provide good drainage and avoid excessive soil moisture by extending intervals between irrigations and avoiding long irrigation periods.
UC IPM Pest Management Guidelines:
R. M. Davis, Plant Pathology, UC Davis
Acknowledgment for contributions to Diseases:W. D. Gubler, Plant Pathology, UC Davis