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SYMPTOMS OF NEMATODE DISEASES

While most nematodes cause root symptoms (either galling or general tissue necrosis), a few nematodes can cause foliar symptoms. An example that can have an impact in the ornamental industry is the nematode Aphelenchoides. This nematode can lead to NECROSIS (tissue death) or DISCOLORATIONS including yellowing or reddening. Often LESIONS (dead areas) are relatively large and delimited (bordered) by veins. This combination of characteristics tends to distinguish Aphelenchoides-induced lesions from those caused by bacteria or fungi. However, actual extraction and identification of the nematode under a microscope is necessary for confirmation.

This photo shows an infection of Aphelenchoides on mum.