Authors: Senyu Chen James E Kurle Salliana R Stetina Daniel R Miller Lee D Klossner George A Nelson Neil C Hansen
Publish Date: 2007/09/05
Volume: 299, Issue: 1-2, Pages: 131-139
Abstract
Experiments were conducted in four commercial fields differing in severity of irondeficiency chlorosis IDC and soybean cyst nematode SCN in Waseca and Lamberton Minnesota to determine the interaction between the IDC and SCN Each experiment was a randomized complete block with a factorial treatment design including 23 cultivars with or without traits of resistance to SCN and IDC The study illustrated the interactive effects of the two defensive traits on the diseases and soybean yields IDC rating was higher in SCNsusceptible than SCNresistant soybean suggesting SCN infection increased IDC Resistance to IDC apparently increased SCN reproduction due to better soybean plant growth Yield response to the defensive traits depended on the disease pressures in a field When both IDC and SCN were present in a field deploying SCNresistance was the best solution to the problems However SCNresistance suppressed soybean yields when used in fields without the disease problems IDCresistance increased yield of SCNsusceptible cultivars but it did not result in detectable yield benefit of SCNresistant cultivars in SCNinfested sites Effective use of the defensive traits for management of IDC and SCN requires specific knowledge of the disease problems present in a fieldThe authors thank J Ballman W Gottschalk C Johnson S Quiring and R Solyntjes for the technical assistance We also thank S Weisberg for the statistical assistance and L Scott and G Sciumbato for the critical review of an earlier version of the manuscript The research was supported by the Minnesota Soybean Producers checkoff funding through the Minnesota Soybean Research and Promotion Council and the Minnesota Agricultural Experiment Station
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