ring spot
nounPlant Pathology.
any of various plant diseases caused by a virus or fungus and characterized by concentric rings of discoloration or necrosis on the leaves.
Origin of ring spot
1First recorded in 1905–10
Words Nearby ring spot
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use ring spot in a sentence
The formation of the second ring-spot sometimes takes place in the present stage (Fig. 42).
Studies in the Theory of Descent (Volumes 1 and 2) | August WeismannOn the first segment only there is210 no spot, and here no ring-spot is afterwards formed.
Studies in the Theory of Descent (Volumes 1 and 2) | August WeismannAt a later period these two222 crescents and also the two primary nuclei coalesce, producing a ring-spot which, as in Fig. 61, Pl.
Studies in the Theory of Descent (Volumes 1 and 2) | August WeismannIn this way the first ring-spot probably arose in some species on only one—the penultimate segment.
Studies in the Theory of Descent (Volumes 1 and 2) | August WeismannA, open ring-spot from another specimen of this species in the same collection.
Studies in the Theory of Descent (Volumes 1 and 2) | August Weismann
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