Thu - July 12, 2018
A three-year regional study was conducted to determine how a shifting SCN population affects nematode reproduction, sudden death syndrome, and soybean yield. Included in the study was an evaluation of fluopyram (ILeVO), a seed treatment fungicide registered for management of sudden death syndrome.
Soybean cultivars with no SCN resistance had more severe SDS symptoms, higher post-harvest SCN egg counts, and lower yield than cultivars with Peking or PI 88788-type of SCN resistance. Cultivars with Peking-type resistance had lower post-harvest SCN egg counts than those with PI 888788-type or cultivars with no SCN resistance. We found that fluopyram seed treatment reduced SDS, but had no effect on SCN.
The study documents a shift in SCN population over a large geographic area, which may impact SDS severity and yield of soybean cultivars with PI 88788-type resistance.