Degree Type

Thesis

Date of Award

2008

Degree Name

Master of Science

Department

Entomology

First Advisor

Jon J. Tollefson

Second Advisor

Linda M. Pollak

Third Advisor

Kenneth H. Holscher

Abstract

Since the discovery of the pest in 1992, western corn rootworm (Diabrotica virgifera virgifera LeConte (WCR)) populations in Serbia have successfully been kept low with crop rotation. This has reduced the efficiency of screening for WCR resistance. A cooperative project between Iowa State University and the Maize Research Institute, Zemun Polje evaluated 13 Serbian commercial corn varieties in Ames, Iowa over a two-year period. Corn hybrids were planted on trap crops where high WCR populations were assumed. Hybrids were evaluated for WCR resistance using a randomized complete block design with four replications. Treatments were paired rows arranged in split plots with one row in each pair treated with insecticide and the other row left untreated. WCR injury was evaluated using a rating of root size and root regrowth (1-6 scale), root injury (0-3 Node Injury Scale), root mass, lodging, and yield. The results indicated significant differences among the Serbian hybrids in the presence of moderate-to-high levels of western corn rootworms. The relative benefit of insecticide treatments for maize lines was a useful tool in evaluating resistant germplasm. However, conducting analyses on relative differences between insecticide treated and untreated plots was not as effective at detecting differences as comparing the plots independently.

DOI

https://doi.org/10.31274/rtd-180813-16647

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Stephanie Rose Kadličko

Language

en

Proquest ID

AAI1457577

OCLC Number

294847636

ISBN

9780549870425

File Format

application/pdf

File Size

60 pages

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