Assertion: canker sore's symptom | /r/AtLocation | the form of lesions
Facets:
Source sentences:
text: At last, it infects the lower surface of the leaf and at this stage, first symptoms appear in the form of lesions which is due to malic acid formation due to intense metabolic activity.
text: Later, the pre-symptoms appear in the form of lesions on the foliage (Leaves), fruits, stems etc.