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Recognizing Signs and Symptoms

Common signs- observation of the actual pathogen or part of the pathogen on or in the host plant.

* click on the links for pictures of the signs and symptoms

1. Bacterial exudates or streaming from infected tissues

2. Fungal mycelium

3. Fungal fruiting structures and spores

4. Body of nematodes

Common Symptoms-visual or otherwise detectable (chemical means) reactions of a plant to infection by a pathogen. Manifestations of the pathogen within or on a host plant.
1. Abnormal coloration: chlorosis (yellowing) / Reddening / Vascular discoloration / necrosis (brown tissue)

2. Wilting of host-leaves

3. Death of host tissue: blight / dieback / necrotic lesions

4. Stunting

5. Replacement of host tissue

6. Water soaking

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