ROOT ROT

An integral part of the root knot nematode symptom is the presence of root rotting and wilting organisms such as Rhizoctonia and Pythium, which cause rotting and the complete breakdown of galled tissue. This is particularly common in the soft fleshy roots of many field and vegetable crops - for example, tomatoes, cucurbit crops (melons, squash, cucumbers, etc.), sugarbeets, lettuce, and okra. Plants whose root systems have more secondary thickening and appear woody seem to be less susceptible to secondary rotting infection; examples are cotton roots and roots of many perennial tree and vine crops.

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

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