The relationship between the causal agent of SDS, SCN
Our study found a negative correlation between SCN and the SDS fungus, indicating that as the probability of finding the SDS fungus in a soil sample increases, the probability of finding SCN in the same soil sample decreases. As the odds of detecting the SDS fungus in soil approach 100%, the likelihood of finding SCN in Wisconsin soybean fields is estimated at just 60%. This negative correlation suggests that SCN and the SDS fungus do not rely on each other to colonize fields. Therefore, fields with heavy SCN pressure are not at greater risk for colonization by the SDS fungus. However, in the infrequent case where SCN and the SDS fungus do occur together, symptoms of disease and damage by both pathogens can be synergistic. Therefore, disease management practices for both pathogens should be implemented in these fields.
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