Common Disease Symptoms
Common names of diseases are always
based on their key symptoms These symptoms are described here.
anthracnose: A characteristic lesion, which is a circular to angular, sometimes
irregular sunken spot with grayish-black center and yellow margin in leaves,
stems, and fruit (e.g., grapevine anthracnose).
areolate mildew: Mildew growth in the area between veins on a leaf (e.g., cotton
areolate mildew).
big vein: A condition in which veins become enlarged (e.g., Lettuce big vein
virus disease).
black scurf: Black flaky or scaly matter adhering to the surface of a plant art
(e.g., black scurf of potato).
blackening: Intensive necrosis that leads to blackening of tissues (e.g., Potato
black ringspot virus disease).
blast: A disease that kills plants suddenly (e.g., rice blast).
blight: A plant disease characterized by withering and shriveling without
rotting (e.g., late blight of potato).
blister blight: A bubble like elevation on the surface of a diseased leaf that results
in withering and shriveling of the leaf (e.g., tea blister blight).
boll rot: Decay of boll, a fruit of plants such as cotton. Boll consists of
a
rounded capsule containing the seeds (e.g.,
cotton boll rot).
brown rot: A condition in which decaying tissues turn brownish (e.g., potato brown
rot).
browning: Cell death leads to necrosis, which leads to the browning of
tissues (e.g., Pea early browning virus disease).
bud blight: Necrosis of buds (Groundnut bud blight virus disease).
bud rot: Decay of buds (e.g., bud rot of coconut).
bunchy top: Leaves arise in clusters, giving a rosette appearance at the top (e.g.,Banana bunchy top virus disease).
bushy stunt: The diseased plant is severely stunted and its shoots are
crowded, giving a bushy appearance (e.g., Tomato
bushy stunt virus disease).
canker: A corky outgrowth formed on leaves, twigs, and fruit (e.g., citrus
canker).
charcoal rot: Decaying tissues turn charcoal (black) in color (e.g., corn
charcoal rot).
chlorosis: Yellowing or whitening may be distributed in the entire plant due o
a partial failure of chlorophyll development in leaves and other plant parts,
causing more or less uniform discoloration (e.g., Tomato chlorosis virusdisease, Lettuce chlorosis virus disease).
club root: Roots are malformed into club like structures due to a thick,
fleshy growth of roots. The root tips are malformed, leaving the basal portions of the root mostly
normal (e.g., club root of cabbage).
collar rot: Decay of the collar region of seedlings at the post emergence
stage (e.g., tobacco collar rot).
crown gall: Abnormal outgrowth or swelling produced due to hyperplasia and
hypertrophy of host cells (e.g., crown gall of several crops, such as apple, peach,
and pear).
crown rot: Rotting of the crown that may spread to the root (e.g., oat crown rot).
curly top: Inward rolling of the leaves with puckering and blisterlike
elevation (e.g., Beet curly top virus disease).
damping-off: Rotting and collapse of seedlings at soil level or prevention