The Overlooked Connection between SDS and SCN
Sudden death syndrome (SDS) showed up in multiple Midwestern states late this summer. Although the yellow, defoliating leaves can appear ‘suddenly,’ the fungus starts infecting the roots much earlier in the season. Cool and wet conditions typically favor SDS development, but weather isn’t not the only contributing factor.
Soybean cyst nematode (SCN) causes extensive root damage, making plants more vulnerable to SDS infection, according to The Ohio State University Extension.
With no mid-season treatment options available for either SDS or SCN, Syngenta advises growers to manage them together in 2017.
A comprehensive preventive strategy includes planting resistant varieties and treating them for protection against both SDS and SCN. In addition to providing SCN resistance, SDS-resistant NK® Soybean varieties offer the industry’s best SDS ratings when compared to competitors’ varieties.
To enhance the performance of those varieties, Clariva® Complete Beans seed treatment, a combination of separately registered products, offers season-long SCN protection and can help reduce the impact of both pathogens. The addition of Mertect® 340-F fungicide applied with Clariva Complete Beans helps to further protect high-value seed with added SDS protection.
Jason Bond, plant pathologist at Southern Illinois University, recommends treating resistant varieties to target both fungi and nematodes together because the two pests are attacking soybean roots at the same time. The seedling stage when roots are developing is a critical time to shield soybeans from such pests.
Shawn Conley, professor at the University of Wisconsin-Madison, also discusses the importance of managing SDS and SCN together in this video.
While weather is one factor that growers can’t control, making a proactive decision to protect soybeans from both SDS and SCN can help growers maximize their yield potential.
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