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Resistance to soybean cyst nematode critical to manage yield losses


Soybean cyst nematode (SCN) causes extensive soybean yield loss, and host resistance has been an effective strategy to minimize this loss. However, the widespread use of the PI 88788 source of SCN resistance in the northern U.S. has resulted in shifts in the virulence of nematode populations. In many fields, SCN can now reproduce on PI 88788. 

In a recent paper in Crop Science, researchers report on a study that utilizes a unique dataset derived from the Northern Regional SCN Tests. Eleven years of soybean yield test data were pooled across the northern U.S. along with the host resistance of yield test entries and the characterization of sites for initial nematode egg counts and nematode virulence on resistance sources.  

A yield advantage of nematode resistant entries was documented at environments with low initial egg counts and the yield advantage increased as the initial egg counts increased. At all levels of virulence on PI 88788, breeding lines with resistance from this source yielded more than susceptible entries and there was little yield advantage detected for resistance sources other than PI 88788.

Given the yield advantage of entries developed with the PI 88788 source, recommendations to rotate resistance sources remain critical to prevent further development of virulence on PI 88788. 

Read the full article in Crop Science. Free Preview June 9 - June 16

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