The 2023 SCN trials put on by Iowa State University showed continued growth in the less-common Peking variety resistance, but there is still a ways to go, according to the Iowa State research team.
The trial sites were spread across each of the nine crop reporting districts to test yield and changes in SCN year over year for each variety. Gebhart, an Iowa State Extension entomologist, said this was another year that saw a notable difference in control between Peking and the more common PI 88788 varieties.
Seven of those nine test sites saw a Peking resistance variety as the top yielder. In eight of the test sites, the top-yielding variety that also saw a decrease in SCN population came with the Peking resistance, with the other (South Central in Oskaloosa) not reporting any decline from any varieties.
The sites in West Central (Glidden), Central (Ames), East Central (Urbana), Southwest (Glenwood) and Southeast (Fruitland) had their highest-yielding varieties report a decline in SCN population. In the Fruitland site, Peking resistances made up the top nine yields, all over 73.3 bushels per acre, with eight of those nine reporting smaller SCN populations from the previous year.
“Farmers are strongly advised to grow soybean varieties with the Peking source of SCN resistance in rotation with high-yielding PI 88788 SCN-resistant varieties that support low levels of SCN reproduction in fields infested with the nematode,” the team said.
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