Root damage, plant height, and growth stages of corn were used to compare effects of the western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, and the northern corn rootworm (NCR), D. barheri Smith & Lawrence, in controlled infestations. With each species, root damage ratings increased linearly as infestations increased. Although this trend was similar for both species (regression slopes were equal), NCR did not cause as much damage as did WCR. Likewise, in plots infested with WCR, plant height was reduced at lower infestation rates than with NCR. No differences were found among treatments for plant-growth stages. Since no differences were found in egg viability or for adult emergence between species with each controlled egg-infestation rate, it was apparent that a given population of WCR produced greater damage to corn than the same-size population of NCR.
Document Type: Research Article
Publication date: December 1, 1985
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