Evaluation of soybean varieties resistant to soybean cyst nematode in Iowa
The use of resistant soy varieties is a very effective strategy for managing soy cyst nematode (SCN), and numerous SCN-resistant soy varieties are available for Iowa soy growers.
Each year, Iowa State University personnel evaluate public and private SCN-resistant soy varieties in SCN-infested fields throughout Iowa. The research described in this report was performed to assess the agronomic performance of maturity group (MG) I, II, and III SCN-resistant soy varieties and to determine the effects of the varieties on SCN numbers or population densities.
The results of most of the conducted experiments convincingly illustrate the benefits of utilising SCN-resistant soy varieties for management of this important soy pest. Throughout the experiments, most of the soy varieties with SCN resistance had greater yields than susceptible varieties, although some resistant varieties had greater yields than others. At most locations, end-of-season SCN population densities were significantly greater in plots where susceptible varieties were grown relative to plots planted with resistant varieties.
Nematode control is an extremely important aspect of growing SCN-resistant soy varieties that must be considered when selecting soy varieties. Growing soy varieties in SCN-infested fields in an attempt to maximise soy yields in the short term without any consideration of the effect of the varieties on SCN population densities will seriously reduce the long-term soy productivity of the land.
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Article made possible through the contribution of Iowa State University.