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Iowa State University

Soybean

Entomology

2012

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Measuring The Benefit Of Biological Control For Single Gene And Pyramided Host Plant Resistance For Aphis Glycines (Hemiptera: Aphididae) Management, Michael T. Mccarville, Matthew E. O'Neal Oct 2012

Measuring The Benefit Of Biological Control For Single Gene And Pyramided Host Plant Resistance For Aphis Glycines (Hemiptera: Aphididae) Management, Michael T. Mccarville, Matthew E. O'Neal

Entomology Publications

The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is an economically important pest in the north central United States. In the state of Iowa, economically damaging populations occurred in seven of 11 growing seasons from 2001 to 2011. The high frequency and economic impact of the soybean aphid makes it an ideal candidate for management by using host plant resistance. We compared an aphid-susceptible line to near-isolines that contain Rag1 and Rag2, both alone and pyramided together, to suppress aphid populations and protect yield. Each of four near-isolines, were artificially infested with aphids and grown in small plots in which ...


Soybean Aphid (Hemiptera: Aphididae) Development On Soybean With Rag1 Alone, Rag2 Alone, And Both Genes Combined, Shaylyn Lena Wiarda, Walter R. Fehr, Matthew E. O'Neal Jan 2012

Soybean Aphid (Hemiptera: Aphididae) Development On Soybean With Rag1 Alone, Rag2 Alone, And Both Genes Combined, Shaylyn Lena Wiarda, Walter R. Fehr, Matthew E. O'Neal

Entomology Publications

Aphis glycines Matsumura (Hemiptera: Aphididae) can reduce the yield of aphidsusceptible soybean (Glycine max (L.) Merrill) cultivars. The Rag1 and Rag2 genes confer resistance to some biotypes of A. glycines. These genes individually can limit population growth of A. glycines and prevent yield loss. The impact of these genes when combined is not known. We compared the development of A. glycines on soybean with Rag1 alone (R1/S2), Rag2 alone (S1/R2), both genes combined (R1/R2), or neither gene (S1/S2). In addition, we determined the impact of different levels of aphid infestation on seed yield. The genotypes were ...