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The use of artificial infestations and vertical root pulling evaluations to screen for resistance to the western corn rootworm (Coleoptera: Chrysomelidae)


Journal of the Kansas Entomological Society 67(1): 46-52
The use of artificial infestations and vertical root pulling evaluations to screen for resistance to the western corn rootworm (Coleoptera: Chrysomelidae)
Artificial infestations and paired-row, vertical root pulling strength evaluations were used to study the effect of western corn rootworm, Diabrotica virgifera virgifera Leconte, on corn (Zea mays L.) and to determine if these procedures could be used in preliminary evaluations for resistance to the western corn rootworm. Two commercial corn hybrids, two corn inbreds, and a B84/Iowa Stiff Stalk Synthetic breeding population were artificially infested with 600 and 1200 western corn rootworm eggs per 30.5 cm row length at two Missouri locations. Infestations reduced the plant height of inbred lines SC41R and CI31A and the Pioneer Brand 3184 hybrid. Increases in percent root lodging were found in all cultivars under the high infestation rate. Vertical root pulling resistance was reduced at both infestation rates; however, cultivars did not vary in the reduction of root pulling strength caused by western corn rootworm damage. Cultivars with high vertical root pulling resistance in uninfested plots showed tolerance to the western corn rootworm by losing a lower percentage of their root pulling strength. Significant reductions in vertical root pulling strength in infested rows show the effectiveness of artificial infestations and paired-row vertical root pulling strength evaluations.

Accession: 002530165

DOI: 10.2307/25085490

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Related references

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