do these roots look like they have phytophthora root rot ?

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cynthiasusan Kissimmee, FL May 02, 2015

@davedigsdirt
do these roots look like they have phytophthora root rot ?

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Diana_K Contra Costa County, CA(Zone 9b) May 02, 2015

To diagnose Phytophthora you need to know what species of plant you are dealing with. There are several species of Phytophthora, and while some will grow in a wide range of hosts, others are fairly host specific.
Next, you need to know the geographic area, and which Phytophthora species are known in your area.

Many Phytophthora will travel up the roots and into the stems, and will stain the conductive tissue in the stems. A vertical cut that strips off the bark or outer skin can reveal this.
Some plants show leaf damage from the impaired circulation, and this can help with diagnosis, too.

Once you have pictures of all the locations of the plant (perhaps several plants) start googling images of the Phytophthora species that are known in your area, and attack plants in the same family as yours. If you are still puzzled, then take the samples to local experts.

Best place to take the samples:
I would start with department of agriculture, and university extension services. If these free services cannot help, then get a plant pathologist involved.

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