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Iowa State University

Soybean

Entomology

Theses/Dissertations

Publication Year

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What Are The Consequences Of Resistance? Exploring The Impacts Of Insecticide And Host-Plant Resistance For Insect Pest Management, Ashley Nicole Dean Jan 2019

What Are The Consequences Of Resistance? Exploring The Impacts Of Insecticide And Host-Plant Resistance For Insect Pest Management, Ashley Nicole Dean

Graduate Theses and Dissertations

Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), has been a prominent insect pest in the northcentral region since 2000. Insecticides are the primary management tactic for this pest, but some populations of soybean aphid resistant to pyrethroid insecticides have been reported since 2015. This increases the impact of soybean aphid on soybean, Glycine max (L.) Merr (Fabales: Fabaceae), production, which is already challenged by higher input costs, declining market value, and unpredictable weather. Soybean aphid-resistant varieties are available to farmers but limited to genetic backgrounds that exclude herbicide-tolerance. This is a significant barrier to adoption since farmers rely on herbicide-tolerant ...


Insect Pollinators In Corn And Soybean Agricultural Fields, Michael Joseph Wheelock Jan 2014

Insect Pollinators In Corn And Soybean Agricultural Fields, Michael Joseph Wheelock

Graduate Theses and Dissertations

Iowa's landscape is dominated by row crop agriculture with the majority of acres being in corn and soybean production, and as a result is spatially uniform and functionally homogenized. In landscapes dominated by agriculture, such as those found in Iowa, the availability of mass flowering crop species show strong positive effects on the density of generalist, native pollinators. While soybean, a self-pollinated plant, and corn, a wind pollinated plant, do not require physical pollination for fruit production, they can be a source of nectar and/or pollen for insect pollinators. The first objective is to develop methodology to accurately ...


Distribution Of Two Rotation-Resistant Corn Pests In Eastern Iowa And Effects Of Soybean Varieties On Biology Of Diabrotica Virgifera Virgifera, Michael Wilson Dunbar Jan 2011

Distribution Of Two Rotation-Resistant Corn Pests In Eastern Iowa And Effects Of Soybean Varieties On Biology Of Diabrotica Virgifera Virgifera, Michael Wilson Dunbar

Graduate Theses and Dissertations

The western corn rootworm Diabrotica virgifera virgifera LeConte (WCR) and the northern corn rootworm Diabrotica barberi Smith & Lawrence (NCR) are two significant insect pests of corn in North America. Both species have adapted to crop rotation in the Midwest, NCR through extended diapause and WCR by ovipositing in alternative crops. We conducted surveys during 2008 and 2009 to collect data on the presence of rotation-resistant NCR and WCR. Data were collected by placing Pherocon AM sticky traps in soybean and corn fields and by placing emergence cages in corn fields. Rotation-resistant WCR was most common in the northeastern and east-central ...