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Soybean Cyst Nematode Appearing Early

June 15, 2018
This agronomic image shows Visible SCN on a soybean plant’s roots.

Visible SCN on a soybean plant’s roots. 

We know that soybean cyst nematode (SCN) are capable of causing severe damage to soybean fields throughout the Midwest every year. But this season, some growers may expect greater SCN pressure earlier than usual.

Soybean plants from 2 different fields in central Iowa were brought to Iowa State University on June 5. Numerous adult SCN females were observed on the roots of these soybean plants, which were planted on May 10.

The appearance of these SCN females on soybean roots just 26 days after planting is the earliest the university has ever seen, as it typically takes 5 to 6 weeks or longer after planting for the first SCN females to develop and appear on roots.

The university attributes this rapid development of SCN females to the especially warm temperatures that occurred in Iowa in May. The early arrival of SCN females paired with continued warm temperatures throughout the growing season could result in the presence of more SCN generations in 2018 than in past years. Season-long protection against SCN will be especially important this year.

The university also explains that the 2 soybean plants observed were 2 different SCN-resistant soybean varieties, showing that many SCN populations in Iowa have developed the ability to reproduce, even on SCN-resistant soybean varieties.

Because SCN is the most damaging soybean pest in the U.S, it’s important to use a nematicide seed treatment to help manage this pest. Syngenta recommends Clariva® Elite Beans, a premix formulation of Clariva pn nematicide and CruiserMaxx® Vibrance® seed treatment. Clariva Elite Beans is the only seed treatment on the market that provides season-long, lethal activity and broad-spectrum protection against SCN.

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