Common soybean diseases of the leaves, root, stem and pod can threaten crop production throughout the growing season, prompting pod and seed decay and leading to significant yield loss.
Typically, fungal diseases can occur as early-season foliar disease, but continue after flowering. Foliar disease reduces photosynthesis, causes leaf drop and affects pod set.
Soybean fungal diseases include: anthracnose; Septoria leaf spot (brown spot); brown stem rot; charcoal rot; damping-off; powdery mildew; frogeye leaf spot; Fusarium root rot; Phytophthora root and stem rot; Cercospora blight, leaf spot and purple seed stain; Rhizoctonia root rot; Sclerotinia stem rot (white mold); and the fungus leading to sudden death syndrome (SDS).
Best Practices to Manage Soybean Diseases
Best management practices help minimize the potential for fungicide resistance and include cultural practices, planting disease-tolerant hybrids and applying fungicides with multiple modes of action.
Rotate crops and manage weeds
Because disease organisms can survive in infected residue from crop to crop, there are several cultural practices that can help break this cycle and diminish disease pressure. For example, crop rotation allows surface crop residue to break down, reducing fungal inoculum populations. Incorporating crop residue into the soil can further reduce the disease population the following season. Good weed control removes disease hosts, too.
Plant disease-tolerant varieties
Before planting, a field’s specific disease history should be taken into account and then matched with a resistant soybean variety. For example disease-tolerant seed traits, specific to soybean growers, can be found in Credenz® soybean seed. Select Credenz varieties that can provide built-in protection against stem canker, frogeye leaf spot, Phytophthora root rot and SDS. When followed by timely fungicide applications, Credenz soybeans are best protected against yield-robbing diseases.
Choose seed treatments for protection
A fungicide seed treatment can provide a healthy start for seedlings. ILeVO® soybean seed treatment from Bayer protects against the fungus causing SDS in soybeans. ILeVO provides the most complete SDS protection on the market, because it protects against the below-ground (root rot) and above-ground (foliar) phases of the SDS disease.
Foliar fungicide applications in soybeans
Applying foliar fungicides is another important step to prevent or manage many diseases. For example, Delaro™ fungicide offers unmatched broad-spectrum control. Its advanced formulation delivers best-in-class dual mode of action residual and improved plant health.
In soybeans, the typical time to first apply Delaro is prior to the development of most foliar diseases, between R2 and R5, with applications repeated as necessary. Disease-susceptible cultivars and seed soybeans are most likely to benefit from a Delaro application. For cost efficiency, fungicides can be tankmixed with insecticides and applied in the same trip across the field.
For more information on soybean disease control options from Bayer, contact your local Crop Science representative. Always read and follow label instructions.
Before purchasing seed, selecting a seed treatment or applying any fungicide, please read the entire label for the best possible results and to confirm that the product is effective on the disease you need to control. Every product is not suitable for every situation, and correct application technique will ensure the best results.