corn rootworm

the larva of any of several leaf beetles of the genus Diabrotica that feeds on roots and underground stems: an agricultural pest, especially of corn.

1890–95, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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The efficacy of the corn rootworm control material is affected by how it's applied.
Two trials were conducted on field corn to evaluate various at plant insecticide technologies for corn rootworm efficacy.
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