Assertion: canker sore's symptom | /r/HasProperty | dieback
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Source sentences:
text: When the water conducting tissue (xylem) is killed or blocked, the most prominent symptom is a gradual or rapid wilting, withering, and dieback starting at the shoot tip and progressing down the branch
text: The key symptom of spruce decline is branch dieback, which progresses over two to four years and renders the plant’s appearance unacceptable for most homeowners (Photo 2).