Brown Stem Rot (BSR) and Sudden Death Syndrome (SDS) Diagnosis, mitigation, and variety selection

1
Brown Stem Rot (BSR) and Sudden Death Syndrome
(SDS)Diagnosis, mitigation, and variety
selection

• Peterson Genetics, Inc.

2
Brown Stem Rot

• Caused by Phialophora gregata fungus
• Two known strains

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BSR Symptoms

• Brown Pith
• Foliar Symptoms

Source XB Yang, Iowa State University
Source Craig Grau, University of Wisconsin
Source University of Wisconsin-Madison
Source Mike Peterson, Peterson Genetics
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Disease cycle

• Survives in soybean residue
• No non-host crops
• Cool air temps promote development
• 90 suppresses development
• pH, fertility play a large role
• SCN effect?

Source University of Wisconsin-Madison
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BSR Management

• Tillage/crop residue
• Crop rotation
• Planting and row width?
• Genetic Resistance

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Variety Selection

• 00914 2503N
• 0614 2706N
• 1140 2733N
• 1203 2803N
• 1832N 3122N
• 1933 3153N
• 2103 V3302N
• 2003N 3303N
• 2301N 3323N
• 2302N 3402N
• 2402N V3403N
• 24R203 3702N

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Sudden Death Syndrome

• Caused by Fusarium virguliforme
• More than a dozen genotypes
• Able to overwinter in non-soybean crops

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SDS Symptoms

• Foliar symptoms similar to BSR
• Baby Blue Mold

Source Albert Tenuta, OMAFRA
Source Stephen Koenning, North Carolina
Cooperative Extension Service
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SDS Disease Cycle

• Quickly infects root after germination
• Colonizes vascular systems in young plants
• Cool soils at planting leaves roots susceptible
  to infection
• SCN allows infection later after roots have
  developed natural tolerance
• Early planting date increases severity
• Compaction contributes to infection

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Identify the problem!

• Easy to misdiagnose
• Dont assume!
• Can have both SDS and BSR at once

Source Mike Peterson, Peterson Genetics
Source Mike Peterson, Peterson Genetics
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Tolerant Varieties

• 2301N 4402N
• 2302N 4512N
• 2733N 4600
• 2802N 4610
• 3153N 4702N
• 3702N 4710
• 3912N 5502N

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Thank you