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Plant Pathology

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Research Update

Improving management of white mold in soybeans

Over a decade of extensive multi-year, multi-location research on white mold management in soybeans at NDSU has facilitated the development of recommendations that sharply reduce losses to this disease in soybeans.  Plant pathologist Michael Wunsch provides a concise summary of research results and associated management recommendations in a recorded presentation prepared for the recent ‘Getting It Right in Soybean Production’ webinar.  The video presentation is available on the NDSU YouTube channel at https://www.youtube.com/@NDSUCREC  or by by clicking on the link for ‘2024 Getting it Right Soybean Production Videos’ at https://www.ndsu.edu/agriculture/ag-hub/getting-it-right. 

The following management considerations are discussed at the corresponding time-points.  Chapter breaks have been introduced, making it easy to find the subject materials of interest.

   0:01  Introduction
   4:25  1.    Considerations before planting
   4:35  1a.  Impact of planting into winter rye
  10:25  1b. Optimizing soybean row spacing
  19:20  1c. Optimizing seeding rate
  21:36  2.   Optimizing the deployment of fungicides
  24:15  2a. Optimizing fungicide application timing
  44:26  2b. Optimizing fungicide droplet size
1:02:19  2c. Optimizing fungicide spray volume
1:12:35  2d. Optimizing the number of fungicide applications

Comparative efficacy of fungicides for management of white mold in soybeans:  Data from all products evaluated three or more times in Carrington and Oakes, ND in studies where fungicide droplet size was calibrated relative to canopy characteristics.  

Updated white mold management recommendations for dry edible beans (March 2023).

Updated management recommendations for Ascochyta blight of chickpeas (February 2023).

Optimizing the deployment of fungicides for management of Ascochyta blight.

Management of Fusarium and Aphanomyces root rot in field peas and lentils – impact of planting date, fungicide seed treatment, crop rotation interval, and crop residue levels.

Summary of findings from field studies conducted at multiple locations across North Dakota from 2017-2022.

Updated recommendations for Ascochyta blight management in chickpeas; July 2022.

Fungicide application timing, fungicide efficacy, fungicide tank-mixes with Bravo WeatherStik, optimizing fungicide droplet size, and optimizing fungicide spray volume.

Updated recommendations for white mold management in soybeans and dry beans; March 2022.

  1. Optimizing row spacing, seeding rate, fungicide application timing, and fungicide droplet size for improved dry bean agronomic performance under white mold pressure. 

  2. Comparative fungicide efficacy for white mold management in dry beans. 

  3. Optimizing row spacing, seeding rate, fungicide application timing, fungicide droplet size, fungicide application frequency (once vs. twice), and fungicide application interval for improved soybean agronomic performance under white mold pressure. 

  4. Comparative fungicide efficacy for white mold management in soybeans. 

 

Optimizing profitability of dry edible beans and soybeans under white mold pressure: Summary of a decade of research on the impacts on optimizing row spacing, seeding rate, fungicide application timing, and fungicide droplet size for improved management of white mold. Talk given February 14, 2022 at a meeting organized by Monty’s Plant & Soil Products in Jamestown, ND.

 

Improving the management of Fusarium and Aphanomyces root rot in field peas

Part 1 - Impact of crop rotation on root rot severity and field pea agronomic performance: key findings (user-friendly report)

Optimizing fungicide spray droplet size for improved management of white mold in soybeans and dry beans and Ascochyta blight in chickpeas – Slides illustrating key results.

Improving the management of Ascochyta blight in chickpeas (research update; March 27, 2020).

Part 1 - Comparative fungicide efficacy, fungicides with DMI (FRAC 3) or SDHI (FRAC 7) mode of action 
Part 2 - Comparative fungicide efficacy, premix fungicides and other modes of action 
Part 3 - Comparative fungicide efficacy, fungicide tank-mixes with Bravo WeatherStik (chlorothalonil) – Slides illustrating key results ,  Detailed report 
Part 4 - Optimizing fungicide spray droplet size for improved management of Ascochyta blight of chickpeas (updated March 10, 2021) – Slides illustrating key results
Part 5 - Optimizing fungicide spray volume for improved management of Ascochyta blight of chickpeas – Slides illustrating key results ,  Detailed report

Improving the management of Sclerotinia head rot of sunflowers; slides accompanying on online meeting organized by SDSU, March 17, 2020:

Part 1 – Susceptibility to head rot relative to sunflower growth stage
Part 2 – Prospects for managing head rot in sunflowers with partially resistant hybrids
Part 3 – Prospects for managing head rot in sunflowers with fungicides

Improving the management of white mold in soybeans:  presentations given in Mankato, MN and Brookings, SD; Feb. 25-26, 2020: 

Part 1 – Optimizing fungicide application timing 
Part 2 – Optimizing fungicide application frequency relative to soybean maturity 
Part 3 – Optimizing fungicide spray droplet size 
Part 4 – Fungicide efficacy and prospects for using drop nozzles 

Improving the management of white mold in dry edible beans – presentations given in Grand Forks, ND; Feb. 19, 2020:

Part 1 – Optimizing fungicide application timing 
Part 2 – Optimizing fungicide spray droplet size 

 

Row Crop Tour, NDSU Carrington Research Extension Center; August 29, 2019

 

Improving the management of white mold in soybeans and dry beans:  Frankenmuth, MI and Shipshewana, IN; March 5-6, 2019

Part 1 – Evaluating risk of white mold on the basis of environmental conditions
Part 2 – Impact of row spacing on the agronomic performance of soybeans and pinto beans under white mold pressure 
Part 3 – Impact of seeding rate on the agronomic performance of soybeans under white mold pressure
Part 4 – Optimizing fungicide application timing for improved management of white mold in soybeans and dry beans 
Part 5 – Optimizing fungicide application methods for improved management of white mold in soybeans and dry beans 
Part 6 – Impact of fungicide application rate and application frequency; response to fungicides relative to the growth stage at which conditions favor white mold 

 

Presentation given at the NDSU Advanced Crop Advisors Workshop (Feb. 13, 2019)

Challenges managing Sclerotinia head rot of sunflowers with partially resistant varieties and fungicides 

 

Presentation given at the MonDak Pulse Day (Feb. 7, 2019)

part 1: Managing QoI-resistant Ascochtya blight with fungicides in chickpeas and field peas 
part 2: Managing Fusarium and Aphanomyces root rots in field peas with crop rotation and planting date

 

Management of Pythium, Rhizoctonia, Aphanomyces and Fusarium root rots in peas, lentils, and chickpeas - Montana Agri-Business Association annual meeting, Great Falls, MT  (Jan. 23, 2019)

part 1: Pythium and Rhizoctonia
part 2: Aphanomyces
part 3: Fusarium 

 

Management of Ascochyta blight in chickpeas and field peas – how the disease is introduced to fields and fungicide efficacy; Montana Agri-Business Association annual meeting, Great Falls, MT (Jan. 24, 2019)

part 1: How the Disease is Introduced to Fields
part 2: Fungicide Efficacy

 

Research update – optimizing fungicide application methods for improved management of white mold in dry edible beans; Bean Day, an annual meeting organized by the Northarvest Bean Growers Association (Jan. 18, 2019)

 

Optimizing the agronomic performance of chickpeas under disease pressure -- presentation to the Western Crop and Pest Management School (March 7, 2018).

Fungicide efficacy and application timing for management of white mold in dry edible beans – expanded version (with additional data) of talk given at the Northarvest Bean Growers Association Bean Day in Fargo (Jan. 19, 2018).

 

Management of diseases of peas, lentils and chickpeas – Diseases of seeds, seedlings, and roots given at the Montana State University Crop & Pest Management School (Jan. 2, 2018)

part 1:  Pythium
part 2:  Rhizoctonia
part 3:  Fusarium root rot
part 4:  Aphanomyces root rot

 

Management of foliar diseases of lentils, chickpeas, and field peas given at the Montana State University Crop & Pest Management School (Jan. 3, 2018)

part 1:  Causes of Ascochyta disease outbreaks
part 2:  Fungicide efficacy - management of Ascochyta blight
part 3:  Management of bacterial blight and powdery mildew in field peas
part 4:  Management of anthracnose and white mold in lentils

 

Program staff include Dr. Michael Wunsch, the program leader; Jesse Hafner and Suanne Kallis, research specialists; and a large team of seasonal high school and college students.

Inquiries and questions should be directed to Michael Wunsch at 701-652-2951 or michael.wunsch@ndsu.edu