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Iowa State University

Soybean

Entomology

2011

Articles 1 - 2 of 2

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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 ...


What Is The Economic Threshold Of Soybean Aphids (Hemiptera: Aphididae) In Enemy-Free Space?, Michael T. Mccarville, Charles Kanobe, Gustavo C. Macintosh, Matthew E. O'Neal Jan 2011

What Is The Economic Threshold Of Soybean Aphids (Hemiptera: Aphididae) In Enemy-Free Space?, Michael T. Mccarville, Charles Kanobe, Gustavo C. Macintosh, Matthew E. O'Neal

Entomology Publications

Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a serious pest of soybean, Glycine max (L.) Merr., in the North Central United States. Current management recommendations rely on the application of insecticides based on an economic threshold (ET) of 250 aphids per plant. Natural enemies are important in slowing the increase of aphid populations and can prevent them from reaching levels that can cause economic losses. However, biological control of A. glycines is inconsistent and can be affected negatively by the intensity of agricultural activity. We measured the impact of a natural-enemy-free environment on the capacity of the current ET ...