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Observe for the presence of symptoms and/or signs:

Melissa Kreider

Created on November 7, 2025

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Transcript

Presence of casual organism or direct evidence of casual agents. For example, insects, fungal mycelium, frass (insect excrement), bacterial ooze.

Changes in plant growth or appearance in response to casual agents. For example, wilting, discoloration, galls, necrosis.

Symptoms

Signs