A survey of more than 40 seed companies has re­vealed an increase from a year ago in the number of soybean varieties with Peking soybean cyst nematode (SCN) re­sistance, a positive step as Iowa farmers continue to battle a soybean root parasite that robs crop yields and profits.

There are 866 SCN-resistant varieties and five blends available for 2024, 48 more than 2022 and 40 more varieties identified as providing Peking...