Symptoms are the apparent expressions of presence and progress of disease in the plant.

Types of symptom

• Systematic: The entire plant exhibits symptoms of the disease.
• Localized: The symptoms are restricted to particular plant parts.

Classification of Disease symptoms

NECROTIC SYMPTOMS

Death of certain parts and finally of the whole tree

Wilt

Drooping of the foliage and ultimately the death of plant or tree

• Pathological wilt: When it is caused by some fungus
• Physiological wilt: due to deficiency of moisture

Canker

Definite, relatively localized necrotic lesion

• Cambium is repeatedly killed, cankers with stratified margin develop as a result of repeated callusing
• Death of the part of tree above the canker

Decay Decomposition of wood substance by fungi

• Fungi may attack dead or living tissues in tree
• White rot or brown rot

ATROPHIC OR HYPOTROPHIC SYMPTOMS

• Slowing down in the development
• Subnormal cell divisions
• Dwarfing, yellowing

HYPERTROPHIC SYMPTOMS

• Either excessive cell division or abnormal elongation in cell size
• Galls, tumors