Symptoms of SCN damage apparent early
Management of SCN requires persistence
Successfully managing SCN is not an achievement to be accomplished in one growing season; it is a continual process. To ensure profitable soybean production in SCN-infested fields long-term, a sustained, integrated approach is necessary.
Every field in Iowa in which soybeans will be grown should be checked for SCN. This can be done by checking roots for SCN females (see ICM News article here) or by collecting soil samples to test for SCN (see ICM News article here).
Fields that are known to be infested with SCN and have had resistant soybean varieties grown should be sampled periodically to assess SCN population densities. Knowing if SCN population densities are decreasing, increasing or staying the same in a field over a period of six years or so will indicate how aggressive of an approach to management is needed to maintain profitable soybean production in the field in the future.
Growing nonhost corn in alternating years with SCN-resistant soybean varieties is key to keeping SCN numbers from increasing. Growing varieties with various sources of SCN resistance, if possible, reduces the selection of SCN populations with increased reproduction on the very common PI 88788 source of resistance. Finally, there are new nematode-protectant seed treatments that can be used in conjunction with SCN-resistant soybeans for added defense against the nematode.
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