Soybeans (Glycine max (L.) Merrill) are an important field crop throughout the world. In 2010, soybeans were planted on over 77 million acres and valued at 38.9 billion dollars in the United States (USDA-NASS, 2010). In Michigan, over 2 million acres of soybeans were planted in 2010 (USDA-NASS, 2010). Two important nematode species damage soybeans in Michigan, Heterodera glycines (Ichinohe, 1952) and Pratylenchus penetrans (Cobb, 1917; Filipjev & Schuurmans Stekhoven, 1941). The goal of this research was to discover information to improve management of these nematode species. A survey was conducted in 2011-2011 to determine the extent of H. glycines (soybean cyst nematode, SCN) and P. penetrans (penetrans lesion nematode, PLN) infestation in soybean-producing counties in Michigan (Chapter 2). A study was done from 2008-2010 to determine the effects of SCN-resistant varieties on field populations of SCN (Chapter 3). Finally, greenhouse studies were used to evaluate the effect of PLN on SCN reproduction on resistant varieties (Chapter 4). Improved management of SCN and PLN should increase soybean yields on infested acreage in Michigan.
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