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white spot

noun

Definition of white spot 

1 : any of several diseases of plants marked by light-colored lesions: such as

a : a disease of alfalfa characterized by spotting and yellowing of the foliage and caused by an unbalanced water supply (as from heavy rainfall following a drought)

b : heat canker

c : a disease of turnips caused by a fungus (Cercosporella brassicae)

2 : ich —usually used in plural

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