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United States Department of Agriculture

Agricultural Research Service

Research Project: Detection and Management of Pathogens in Strawberry and Vegetable Production Systems

Location: Crop Improvement and Protection Research

Title: Pseudomonas blight discovered on raspberry in Watsonville

item Bolda, Mark
item Koike, Steve
item Bull, Carolee

Submitted to: Electronic Publication
Publication Type: Popular Publication
Publication Acceptance Date: 4/15/2014
Publication Date: 4/15/2014
Citation: Bolda, M., Koike, S., Bull, C.T. 2014. Pseudomonas blight discovered on raspberry in Watsonville. UCANR Strawberries and Caneberries Blog. Available:

Interpretive Summary:

Technical Abstract: In the winter (February) of 2013, a field of raspberries in Watsonville was discovered to be infected with Pseudomonas syringae, the causal agent of Pseudomonas blight disease. This was the first documentation of this disease on raspberry in our region. The infection of raspberry plants is manifested by brown, angular-shaped, water-soaked spots on the developing leaves, petioles and emerging plants. Many of the smaller, emerging plants had died-back, but thanks to the carbohydrate reserves in the crowns and roots, they grew-back and recovered once the weather warmed-up. To our knowledge, this is the first report of Pseudomonas blight of raspberry, caused by P. syringae, in California.

Last Modified: 10/19/2017
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