Saturday, August 17, 2013
The visible symptoms of a plant disease are the plant’s reaction to what is causing the problem. Plant symptoms include:
Blight: a rapid discoloration and death of twigs, foliage or flowers.
Canker: dead area on bark or stem, often sunken or raised.
Chlorosis: yellowing of the leaves.
Decline: progressive decrease in plant vigor.
Dieback: progressive death of shoot, branch or root starting at the tip.
Distortion: malformed plant tissue.
Gall or gall-like growth: abnormal local swelling or enlargement of plant part. Galls may be caused by insects or diseases.
Gummosis: an oozing of gum or sap, usually along the trunk of a tree or on fruit.
Leaf distortion: the leaf could be twisted, cupped, rolled or otherwise deformed.
Leaf scorch: burning along the leaf margin and into the leaf from the margin.
Leaf spot: a spot or lesion on the leaf.
Mosaic: varying patterns of light and dark plant tissue.
Necrosis: dead tissue.
Stunting: lack of growth.
Wilt: general wilting of the plant or plant part.
Witches broom: abnormal broom-like growth of many weak shoots.
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