November 11, 2021
Evaluation of Disease Management Systems in Soybean – Sudden Death Syndrome- 2021
TRIAL OBJECTIVE
Sudden death syndrome (SDS) is among the most devastating soil-borne diseases of soybean in the U.S. The disease has spread extensively and causes high soybean yield losses throughout the North Central Region. SDS is most severe when soybean is planted early into cool, wet soils, when heavy midsummer rains saturate the soil, and when soybean cyst nematode (SCN) is present.
The objective of this study was to evaluate a system-based approach for SDS disease management supported by genetic resistance of germplasm and seed treatment options.
RESEARCH SITE DETAILS
- Select soybean products with varying levels of resistance to SDS were evaluated under two different Acceleron® Seed Applied Solutions options:
- STANDARD
- STANDARD + ILEVO® Seed Treatment
- Soybean products selected for this trial were classified as susceptible (S), moderately susceptible (MS), moderately resistant/moderately susceptible (MR/MS), moderately resistant (MR), or resistant (R) to SDS.
- Fields with a history of SDS were selected for this study.
- Plots were randomized within the trial.
- SDS disease ratings were taken at the R6 growth stage.
- Data collected from 2018 through 2020 and a total of 15 locations with SDS symptoms were analyzed for this study. Locations were from across the North Central growing region including IN, KS, MO, IL, IA, KY, and NE. Most locations had mild to moderate SDS incidence and severity.
UNDERSTANDING THE RESULTS
Base = Acceleron® STANDARD Seed Applied Solutions in 2019 and 2020; Acceleron® STANDARD Seed Applied Solutions + Poncho® Votivo® in 2018.
ILEVO® = Acceleron® STANDARD Seed Applied Solutions plus ILEVO® Seed Treatment in 2019 and 2020; Acceleron® STANDARD Seed Applied Solutions + Poncho® Votivo® + ILEVO® Seed Treatment in 2018.
SDS disease index: 1 = no disease, 9 = severe disease.
Figure 1. Sudden Death Syndrome disease index rating by Acceleron® Seed Applied Solutions treatment and SDS disease classification of soybean products. Mean separation letters (a, b) denote statistically significant differences at an alpha = 0.1.
Base = Acceleron® STANDARD Seed Applied Solutions in 2019 and 2020,; Acceleron® STANDARD Seed Applied Solutions + Poncho®/Votivo® in 2018
ILEVO® = Acceleron® STANDARD Seed Applied Solutions plus ILEVO® Seed Treatment in 2019 and 2020,; Acceleron® STANDARD Seed Applied Solutions + Poncho®/Votivo® + ILEVO® Seed Treatment in 2018
Figure 2. Average soybean yield by Acceleron® Seed Applied Solutions treatment and SDS disease classifications of soybean products. Mean separation letters (a, b) denote statistically significant differences at an alpha = 0.1.
Base = Acceleron® STANDARD Seed Applied Solutions in 2019 and 2020,; Acceleron® STANDARD Seed Applied Solutions + Poncho®/Votivo® in 2018
ILEVO® = Acceleron® STANDARD Seed Applied Solutions plus ILEVO® Seed Treatment in 2019 and 2020,; Acceleron® STANDARD Seed Applied Solutions + Poncho®/Votivo® + ILEVO® Seed Treatment in 2018
Figure 3. Effect of seed treatment on average soybean yield measured across soybean products, location, and years (2018 through 2020). Mean separation letters (a, b) denote statistically significant differences at an alpha = 0.1.
Figure 4. Comparison of the difference in soybean product SDS disease incidence and severity. One product with an SDS disease rating of 8 and another product with a rating of 3. SDS disease index: 1 = no disease, 9 = severe disease.
In locations where the most susceptible soybean product and the base seed treatment had an average SDS rating of at least 3:
There was a significant ILEVO® Seed Treatment effect on SDS management and yield potential. Soybeans with ILEVO® seed treatment had yields 2 bu/acre greater than the untreated check.
Genetics with enhanced resistance to SDS coupled with ILEVO® provided a significant yield advantage over moderately susceptible soybean products without ILEVO® Seed Treatment and susceptible products with or without ILEVO® seed treatment.
KEY LEARNINGS
- ILEVO® Seed Treatment is a potential solution currently available for sudden death syndrome (SDS) and continues to provide excellent management of SDS and protect yield potential. Depending on SDS risk for your field, pairing with the right soybean products should be considered to help maximize yield potential.
Evaluation of Disease Management Systems in Soybean – Sudden Death Syndrome - 2020
Trial Objective
- Sudden death syndrome (SDS) is among the most devastating soil-borne diseases of soybean in the U.S. The disease has spread extensively and causes most of the soybean yield losses throughout the North Central Region. SDS is most severe when soybean is planted early into cool, wet soils, when heavy midsummer rains saturate the soil, and when soybean cyst nematode (SCN) is present.
The objective of this study was to evaluate a system-based approach for SDS disease management supported by genetic resistance of germplasm and seed treatment options.
RESEARCH SITE DETAILS
Select soybean products with varying levels of resistance to SDS were evaluated under two different Acceleron® Seed Applied Solution options:
- STANDARD
- STANDARD + ILeVO®
Soybean products selected for this trial were classified as susceptible (S), moderately susceptible (MS), moderately resistant/moderately susceptible (MR/MS), moderately resistant (MR), or resistant (R) to SDS.
Fields with a history of SDS were selected for this study.
Plots were randomized within the trial.
SDS disease ratings were taken at the R6 growth stage.
- Data from 2 years and a total of 11 locations with SDS symptoms were analyzed for this study, and the data shown below is the average of the 11 locations across 2 years. Most locations had mild to moderate SDS incidence and severity.
UNDERSTANDING THE RESULTS
Soybean products treated with Acceleron® STANDARD + ILeVO® resulted in significantly lower SDS disease incidence and severity and higher average yield compared to Acceleron STANDARD across all SDS disease classifications of products.
Soybean products with enhanced resistance to SDS (i.e. resistant or moderately resistant) provided an average yield advantage of 4 bu/acre over susceptible genetics and showed substantially lower SDS disease incidence and severity.
KEY LEARNINGS
ILeVO® seed treatment is the first and only solution currently available for SDS and continues to provide excellent SDS control and yield protection. Depending on SDS risk for your field, pairing with the right soybean products should be considered to help maximize yield potential.
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