One species of the Fusarium fungus can lead to sudden death syndrome, but Giesler says he doesn't expect SDS to be a problem in 2013 since the disease requires more moisture to develop.
There is limited Fusarium resistance available in soybean varieties, he adds. "Check with you seed dealer about their varieties," he says
Seed treatments have some activity against the disease, he says.
SCN continues spreading across Nebraska, with confirmation in 54 counties of eastern and central Nebraska, regions that constitute 90% of the state's soybean production. SCN was originally found along Missouri River counties but has been identified as far west as Red Willow County the past few years.
"Based on the frequency and level of infestations in some of these counties, it would appear SCN has been present in those areas for a number of years and only recently identified," Giesler says.
SCN is difficult to identify based on outward symptoms. The first symptom, according to Geisler, is a healthy-looking soybean field that does not meet yield expectations. Yields losses can be 30% or more.
"In 2012, there were fields that yielded extremely low vs. soybeans across the fence in adjacent fields. Anytime there is moisture stress, SCN becomes more damaging, he says.
Giesler says there are a large number of varieties on the market with some resistance to SCN.
He stresses the importance of taking soil samples to identify if SCN is presents. He recommends obtaining sample bags from your local UNL Extension educator or call the UNL Department of Plant Pathology, at 402-472-2559, which can send you a free sample bag. The Nebraska Soybean Board has provided funds to support SCN sampling.