Iowa: Soybean Varieties SCN Resistance Different from PI 88788

    Soybean cyst nematode on soybean roots. Arrows point to cysts (swollen female nematodes filled with eggs). Photo: University of Minnesota

    A recent ICM News article summarized the updated Soybean Cyst Nematode-resistant Soybean Varieties for Iowa ISU Extension publication, available online. The publication provides information on 872 SCN-resistant soybean varieties available in Iowa for 2022.

    As explained in the earlier ICM News article, there are several sources of resistance available to develop SCN-resistant soybean varieties, but one named PI 88788 has been used in more than 95% of SCN-resistant soybean varieties for Iowa in the last 15 years.

    Because of the continuous widespread use of this set of resistance genetics, SCN populations in many Iowa fields now have increased feeding and reproduction on soybean varieties with PI 88788 SCN resistance, resulting in increased yield loss.

    Farmers are encouraged to seek out and rotate the sources of SCN resistance they are using with their soybean varieties. In addition to PI 88788, two other sources of resistance also available are Peking and PI 89772.

    Below is a table of 34 varieties for 2022 that have SCN resistance from Peking. Consult the ISU Extension publication linked to above for information about the herbicide resistance or tolerance and iron deficiency chlorosis tolerance levels of the varieties.

    Soybean varieties in maturity groups 1, 2, and 3 with the Peking source of SCN resistance available for use in Iowa.

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    In addition to the varieties with Peking SCN resistance mentioned above, there are two soybean varieties with SCN resistance from PI 89772. They are Golden Harvest brand GH2329X and NK brand NK S23-G5X, both with a relative maturity 2.3.

    Rotating SCN resistance sources will help to keep these management tools effective at helping farmers keep SCN population densities as low as possible and maximize soybean yields.

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