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2006

Iowa State University

Agricultural Science

Theses/Dissertations

Entomology

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Management Of Grape Colaspis, Colaspis Brunnea (Coleoptera: Chrysomelidae), In Seed Corn Production , Benjamin Carl Kaeb Jan 2006

Management Of Grape Colaspis, Colaspis Brunnea (Coleoptera: Chrysomelidae), In Seed Corn Production , Benjamin Carl Kaeb

Retrospective Theses and Dissertations

In recent years, grape colaspis, Colaspis brunnea (F.), larvae have caused significant injury to seed corn by feeding on the surface of the root, denuding it of root hairs. This study tested two management techniques for C. brunnea in seed corn. The first objective was to test the efficacy of commercially available insecticides, specifically neonicotinoid seed treatments, in protecting commercial seed corn from C. brunnea larval injury. The results of this study showed insecticides offer protection to the seedling corn from C. brunnea larvae; however, no insecticide treatment significantly outperformed any other. The second objective was to develop and test ...


Sampling And Management Of Aphidophagous Natural Enemies In Iowa Soybean , Nicholas Patrick Schmidt Jan 2006

Sampling And Management Of Aphidophagous Natural Enemies In Iowa Soybean , Nicholas Patrick Schmidt

Retrospective Theses and Dissertations

In Iowa, surveys of natural enemies in soybean [Glycine max (L.) Merr.] conducted before the arrival of Aphis glycines Matsumara (Hemiptera: Aphididae) revealed several species that may contribute to the mortality of A. glycines. In 2004 and 2005, several sampling methods were investigated to determine if diversity of the natural enemy community in Iowa soybean has changed with the arrival of A. glycines. We hypothesized that the natural enemy community in soybean has changed with the introduction of A. glycines and that sampling methods would collect different species of natural enemies. Also, with the use of an alfalfa living mulch ...