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Phytophthora Identification and Sampling in Citrus Nurseries1

Jamie D. Burrow, Diane B. Bright, Tim D. Riley, Evan G. Johnson, and James H. Graham 2

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Phytophthora species are important soilborne, fungus-like pathogens that attack the root systems, trunk, and fruit of citrus trees at any age. The front of this identification sheet includes images of healthy and infested roots and descriptions of leaf and root symptoms. The back lists sampling procedures: soil collection, soil testing, and diagnosing phytophthora.


1. This document is SL431, one of a series of the Plant Pathology Department, UF/IFAS Extension. Original publication date July 2015. Revised July 2019. Visit the EDIS website at
2. Jamie D. Burrow, Extenion program manager, Citrus Research and Education Center; Diane B. Bright, senior biological scientist, Citrus REC; Tim D. Riley, plant pathologist, Citrus Health Response Program, USDA APHIS PPQ; Evan G. Johnson, assistant research scientist, Citrus REC; and James H. Graham, professor emeritus, Soil and Water Science Department, Citrus REC; UF/IFAS Extension, Gainesville, FL 32611.

Publication #SL431

Date: 7/9/2019

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Johnson, Evan G.

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Bright, Diane B

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  • Jamie Burrow