2016
Influences of Planting Date, ILeVO Seed Treatment, Root Structure and Soil Compaction upson SDS in Kansas
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Contributor/Checkoff:
Kansas Soybean Commission
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Christopher Little, Kansas State University
Co-Principal Investigators:
Project Code:
1648
Contributing Organization (Checkoff):
Kansas Soybean Commission
(n/a)
Institution Funded:
Kansas State University
(n/a)
Brief Project Summary:

Sudden death syndrome, caused by the soil-borne pathogen Fusarium virguiliforme, is a soybean disease causing foliar spots, root decay and yield loss. SDS also can weaken the host making it more susceptible to abiotic stresses, pest infestation, and other diseases. The goals of this project are to determine th influence of planting date on SDS; examining the interaction between ILeVO seed treatment and planting date for SDS; determining the relationship between root structure and SDS severity; and determining the relationship between soil compaction and SDS severity.

Key Benefactors:
farmers, agronomists, plant pathologists

Information And Results
Final Project Results

Update:

View uploaded report PDF file

1. Traditionally, soybean planting dates in the Kansas River Valley have been delayed until after mid-May to help avoid the development of SDS. Planting date studies over the past two years have shown that SDS symptoms have been more severe in earlier plantings (first of May). As the planting dates progressed later the SDS severity decreased. However, the highest yields in these studies occurred with the earlier planting dates, in spite of increased SDS disease severity. Yields decreased by an average of almost 0.5 bu per day for more tolerant varieties when planting was delayed after the end of April or the first of May, and 0.3 bu per day for the more susceptible varieties. In both years, the SDS severity was not as high as previously observed at KRV.

2. As predicted, ILeVO reduces SDS disease severity. Moderately resistant soybeans show improved yield compared to susceptible regardless of ILeVO use.

3. Plants with longer root systems appear to have decreased SDS severity compared to those with shorter root systems. The SDS pathogen itself decreases root length for both moderately resistant and susceptible genotypes.

4. For both years of the compaction study (2015 and 2016), there was no impact of compaction on disease severity or yield. Thus, compacted soil may not influence sudden death syndrome in the Kansas River Valley. This may be due to the soil types that are common in the area. However, sub- surface compaction appears to be related to increased disease severity, although this finding is preliminary and non-significant.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.