Black canker

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a disease in turnips and other crops, produced by a species of caterpillar.
See under Black.

See also: Black, Canker

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Black canker can be introduced in seed or from the ground.
Another lesson I learned is that beech trees are being attacked by black canker. I do not know the severity of this disease or whether it represents the ultimate demise of the beech tree population.
The fungus emerges as rows of small, black cankers on limbs, eventually girdling infected branches and killing the leaves.