corn rootworm

noun
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.

Origin:
1890–95, Americanism

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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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