ROOT LESION NEMATODES

Necrotic lesions can be induced by root lesion nematodes (Pratylenchus) on the roots of many host plants. These lesions are visible as a darkening or browning of roots at sites of invasion and underlying feeding sites within the root cortex. In later stages, more general necrosis and root rot may occur so that plants eventually have poorly developed, often brown colored root systems. The lesioned cortical tissue will often slough off, and the portion of the root distal to the lesion will die. Although lesion symptoms are indicative of root lesion nematode damage, the root lesion nematode does not produce lesions on some hosts whereas on other plants similar lesions can be induced by other disease organisms and soil factors.

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

Pratylenchus vulnus on walnut
Pratylenchus vulnus on prune

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