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Soybean Cyst Nematode Reproduction in the North Central United States

January 2000 , Volume 84 , Number  1
Pages  77 - 82

J. Wang , P. A. Donald , and T. L. Niblack , Department of Plant Pathology, University of Missouri, Columbia 65211 ; G. W. Bird , Department of Entomology, Michigan State University, East Lansing 48824 ; J. Faghihi and J. M. Ferris , Department of Entomology, Purdue University, West Lafayette 47907 ; C. Grau , Department of Plant Pathology, University of Wisconsin, Madison 53706 ; D. J. Jardine , Department of Plant Pathology, Kansas State University, Manhattan 66506 ; P. E. Lipps , Department of Plant Pathology, Ohio State University, Columbus 43210 ; A. E. MacGuidwin , Department of Plant Pathology, University of Wisconsin ; H. Melakeberhan , Department of Entomology, Michigan State University ; G. R. Noel , USDA ARS, Crop Protection Research Unit and Department of Crop Sciences, University of Illinois, Urbana 61801 ; P. Pierson and R. M. Riedel , Department of Plant Pathology, Ohio State University ; P. R. Sellers , Department of Botany and Plant Pathology, Purdue University ; W. C. Stienstra , Department of Plant Pathology, University of Minnesota, St. Paul 55108 ; T. C. Todd , Department of Plant Pathology, Kansas State University ; G. L. Tylka , Department of Plant Pathology, Iowa State University, Ames 50011 ; T. A. Wheeler , Department of Plant Pathology, Ohio State University ; and D. S. Wysong , Department of Plant Pathology, University of Nebraska, Lincoln 68583



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Accepted for publication 29 September 1999.
ABSTRACT

An experiment was conducted in Heterodera glycines-infested fields in 40 north central U.S. environments (21 sites in 1994 and 19 sites in 1995) to assess reproduction of this nematode. Two resistant and two susceptible soybean cultivars from each of the maturity groups (MG) I through IV were grown at each site in 6.1 m by 4 row plots. Soil samples were collected from each plot at planting and harvest and processed at Iowa State University to determine H. glycines initial (Pi) and final (Pf) population densities as eggs per 100 cm3 of soil. Overall, reproduction (Pf/Pi) of H. glycines on susceptible cultivars in all MG was similar. Reproduction was higher on MG III and IV susceptible cultivars than on those in MG I and II. Resistant MG I and II cultivars reduced nematode population densities more consistently than those in MG III and IV. Reproduction of the nematode was similar among sites within the same maturity zone (MZ), defined as the areas of best adaptation of the corresponding MG. Nonetheless, careful monitoring of nematode population densities is necessary to assess changes that occur over time in individual fields.


Additional keywords: Glycine max, soybean maturity group, soybean maturity zone

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