CITRUS NEMATODE

Citrus nematode infection causes a reduction of the citrus root system. Another common symptom of infection by high populations of this nematode is the encrusted appearance of the roots due to the soil particles that adhere to the female's jellylike egg matrix ("dirty roots"). The soil particles will not be readily removed by water. This symptom occurs on other hosts, such as grapes, and, although it cannot be taken as a positive diagnosis alone, it can help to determine the extent of field infestation in an area where citrus nematode has been positively identified.

From: McKenry, M.V. and P. A. Roberts. 1985. Phytonematology Study Guide. University of California, Division of Agriculture and Natural Resources. Publication 4045.

Tylenchulus semipenetrans on citrus, healthy on left

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