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January 22nd, 2019 / Genetic Literacy Project, US

Soybean cyst nematode (SCN) [a common soybean pest] has overcome the main source of genetic resistance – PI 88788 – that accounts for 95% of resistance in SCN-resistant soybean varieties. Research scientists….have been developing new sources of genetic resistance and new SCN resistance management strategies.

Ultimately, the goal is to identify alternative resistance genes and gene combinations that, when used in rotation, will reduce SCN population densities and slow selection pressure on SCN to adapt.

“It’s clear that SCN populations are shifting,” says Melissa Mitchum, a University of Missouri nematologist. “Every 10 years we conduct a statewide survey. Over the past 30 years we’ve seen a shift to populations that are able to reproduce on PI 88788.”Read more