In this video I visit a soybean field to talk about white mold, row spacing, planting population and the new Sporecaster white mold management smartphone app. in an effort to develop an integrated management strategy for white mold control.
In this video I visit a soybean field that shows signs of low emergence due to soil crusting and Pythium seed rot. The field has experienced cool wet weather after planting. I discuss the issues and potential management.
Damon Smith, Extension Field Crops Pathologist, Department of Plant Pathology, University of Wisconsin-Madison
Many public universities collaborate on international research and outreach efforts, but you may not understand the impact that this work can have even for farmers in the Midwest. We have assembled three new videos in a series, in an effort to demonstrate our impact in conducting collaborative research and outreach work. This work is ongoing and is being conducted in Chile and here in the Midwest. The focus is to produce soybean germplasm that is highly resistant to white mold, a major disease in the upper Midwest. This research is funded by the Wisconsin Soybean Marketing Board and the North Central Soybean Research Program. Travel support for graduate student, Megan McCaghey, was all made possible by the Walter R. Stevenson Fund for Graduate Student Travel. This collaborative effort includes researchers here at the University of Wisconsin-Madison and Researchers at Iowa State University, including Dr. Daren Mueller. We would like to thank Brandon Kleinke, Iowa State University, for his work in shooting video footage and assembling this video series. To watch the videos, click here.
Damon Smith, Field Crops Extension Pathologist, University of Wisconsin-Madison
Roger Schmidt, Nutrient and Pest Management Program, University of Wisconsin-Madison
Shawn Conley, Soybean Extension Agronomist, University of Wisconsin-Madison
Sporecaster: A New Soybean White Mold Prediction App for your Smartphone
Sporecaster is a new smartphone application designed to help farmers predict the need for a fungicide application to control white mold in soybean. The app, which is free to use, was developed with support from the Wisconsin Soybean Association and Wisconsin Soybean Marketing Board. It was programmed by personnel in the UW-Madison Nutrient and Pest Management Program.
Sporecaster uses university research to turn a few simple taps on a smartphone screen into an instant forecast of the risk of apothecia being present in a soybean field, which helps growers predict the best timing for white mold treatment during the flowering period.
To learn more about the app, how to download and how to use it, click here.
Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin-Madison
Have you been struggling with white mold in soybeans over the last couple of field seasons? Do you want to know more about possible approaches to managing white mold in soybean? You might find this new video helpful in your operation. Dr. Damon Smith, UW Field Crops Pathologist, discusses recent data on research of soybean white mold in the North Central U.S. He also provides management recommendations that farmers and practitioners should consider to manage this persistent disease of soybean. For more information on managing white mold you can consult the UW Field Crops Pathology webpage by CLICKING HERE and scrolling down to the white mold section or visit the Crop Protection Network webpage on white mold.
Jaime Willbur, Graduate Research Assistant, University of Wisconsin-Madison
Sclero-cast: A Soybean White Mold Prediction Model
**This tool is for guidance only and should be used with other sources of information and professional advice when determining risk of white mold development. We encourage you to read the model how-to guide which can be downloaded by clicking here**
Continued dry conditions over the past couple of weeks have helped to continue to decrease white mold risk in non-irrigated fields (Fig. 1). Some areas of high risk still exist in the southern and eastern portions of the state. However, many fields we have visited are moving to R3 and R4 growth stages. Thus, they are getting outside of the extremely critical period for infection by the white mold fungus. Some reports of symptoms of white mold are beginning to come in. I suspect we will begin to see more symptoms of disease over the next couple of weeks and will begin to get an understanding of how severe the epidemic will be this year.
Risk remains high for any soybeans planted to 15-inch rows AND irrigated (Fig. 2). This planting and management scenario is highly conducive for white mold development. We continue to find apothecia under irrigation and in 15-inch row-spacing. I would expect to see significantly higher levels of white mold in irrigated soybeans planted to 15-inch rows. Risk of white mold remained steady for soybeans planted to 30-inch rows and irrigated (Fig. 3). Risk remains high in the southwestern and western portions of Wisconsin for soybeans planted to 30-inch rows and irrigated (Fig. 3).
Forecasts indicate cool temperatures with chances of precipitation for the next week. I would expect white mold risk to hold steady. Continue to growth-stage soybeans and note that map predictions should be considered for making white mold management decisions if soybeans are flowering AND soybean canopies are nearly closed. We have visited fields all over the state and find soybeans well into the reproductive growth stages. We are quickly getting outside the window of opportunity to treat for white mold. Any remaining white mold management decisions should be made very soon. For more information on white mold and white mold management, see this previous post.
 Figure 1. Apothecial Risk for non-irrigated soybean fields (August 5, 2017) |
 Figure 2. Apothecial Risk for soybeans planted to 15″ rows, under irrigation (August 5, 2017) |
 Figure 3. Apothecial Risk for soybeans planted to 30″ rows, under irrigation (August 5, 2017) |
Map Legend: White = model is inactive and risk of apothecia in the field is likely low; Gray = apothecia might be present, but likelihood of apothecial presence is less than 5%; Blue = low risk of apothecia in the field (5 to <15% chance); Yellow = moderate risk of apothecia in the field (15 to <30% chance); Red = high risk of apothecia in the field (30% or higher chance). Model predictions must be combined with soybean growth stage and canopy characteristics to aid in timing of fungicide sprays.
These models were developed at the University of Wisconsin-Madison in conjunction with Michigan State University and Iowa State University to identify at-risk regions which have been experiencing weather favorable for the development of white mold fungus apothecia. Weather information and maps are provided by the Soybean Integrated Pest Information Platform for Extension and Education (iPIPE), which is managed by ZedX, Inc. This model predicts when apothecia will be present in the field using combinations of 30-day averages of maximum temperature, relative humidity, and maximum wind speed. Using virtually available weather data, predictions can be made in most soybean growing regions. Based on these predictions, a map is generated under three scenarios (non-irrigated soybeans, soybeans planted on 15″ row-spacing and irrigated, or soybeans planted on 30″ row-spacing and irrigated). The maps are colored to show the likelihood of apothecial presence within a region. If the model is predicting high risk (red) in your area for your planting scenario, the soybeans are flowering, and the canopy is somewhat closed, then the white mold risk is elevated. If your fields are at-risk, we recommend to consult your local extension personnel or resources for the best in-season management options for your area For further information on how to use and interpret these risk maps, CLICK HERE to download a how-to guide.
Jaime Willbur, Graduate Research Assistant, University of Wisconsin-Madison
Sclero-cast: A Soybean White Mold Prediction Model
**This tool is for guidance only and should be used with other sources of information and professional advice when determining risk of white mold development. We encourage you to read the model how-to guide which can be downloaded by clicking here**
Mostly dry conditions over the past week helped to decrease white mold risk in non-irrigated fields in many locations in the southern and south-central portion of the state (Fig. 1). However, risk remains high in the central area of the state and in portions of the far southern tier of counties.
Risk has increased substantially across the entire state for any soybeans planted to 15-inch rows AND irrigated (Fig. 2). This planting and management scenario is highly conducive for white mold development. We are finding increased numbers of apothecia under irrigation and in 15-inch row-spacing. Risk of white mold also increased slightly in the southwestern and western portions of Wisconsin for soybeans planted to 30-inch rows and irrigated (Fig. 3).
Forecasts indicate seasonable temperatures with little precipitation for the next week. This will give many of us a chance to dry out a bit from above-normal rainfall in July. I expect white mold risk to hold steady or decrease a bit given the forecasts. Continue to growth-stage soybeans and note that map predictions should be considered for making white mold management decisions if soybeans are flowering AND soybean canopies are nearly closed. For more information on white mold and white mold management, see this previous post.
 Figure 1. Apothecial Risk for non-irrigated soybean fields (July 27, 2017) |
 Figure 2. Apothecial Risk for soybeans planted to 15″ rows, under irrigation (July 27, 2017) |
 Figure 3. Apothecial Risk for soybeans planted to 30″ rows, under irrigation (July 27, 2017) |
Map Legend: White = model is inactive and risk of apothecia in the field is likely low; Gray = apothecia might be present, but likelihood of apothecial presence is less than 5%; Blue = low risk of apothecia in the field (5 to <15% chance); Yellow = moderate risk of apothecia in the field (15 to <30% chance); Red = high risk of apothecia in the field (30% or higher chance). Model predictions must be combined with soybean growth stage and canopy characteristics to aid in timing of fungicide sprays.
These models were developed at the University of Wisconsin-Madison in conjunction with Michigan State University and Iowa State University to identify at-risk regions which have been experiencing weather favorable for the development of white mold fungus apothecia. Weather information and maps are provided by the Soybean Integrated Pest Information Platform for Extension and Education (iPIPE), which is managed by ZedX, Inc. This model predicts when apothecia will be present in the field using combinations of 30-day averages of maximum temperature, relative humidity, and maximum wind speed. Using virtually available weather data, predictions can be made in most soybean growing regions. Based on these predictions, a map is generated under three scenarios (non-irrigated soybeans, soybeans planted on 15″ row-spacing and irrigated, or soybeans planted on 30″ row-spacing and irrigated). The maps are colored to show the likelihood of apothecial presence within a region. If the model is predicting high risk (red) in your area for your planting scenario, the soybeans are flowering, and the canopy is somewhat closed, then the white mold risk is elevated. If your fields are at-risk, we recommend to consult your local extension personnel or resources for the best in-season management options for your area For further information on how to use and interpret these risk maps, CLICK HERE to download a how-to guide.
Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin-Madison
Jaime Willbur, Graduate Research Assistant, University of Wisconsin-Madison
Sclero-cast: A Soybean White Mold Prediction Model
**This tool is for guidance only and should be used with other sources of information and professional advice when determining risk of white mold development. We encourage you to read the model how-to guide which can be downloaded by clicking here**
Higher average temperatures this week helped to decrease white mold risk in non-irrigated fields in some locations in the southern and south-central portion of the state (Fig. 1). However, risk remains high in the central area of the state and in portions of the western region.
Areas of high risk have increased in irrigated soybeans planted to 15-inch rows (Fig. 2). Soybeans planted to 15-inch rows and irrigated are under high risk for white mold development in much of the state of Wisconsin. This is consistent with our field observations. Our crew has mostly found apothecia (the small, cup-shaped mushroom) in fields that are irrigated and planted to the 15″ row-spacing. Risk of white mold increased slightly in several pockets along the Wisconsin River Valley and in Jackson and Trempealeau Counties for soybeans planted to 30-inch rows and irrigated (Fig. 3).
Forecasts indicate cooler weather next week. This may increase risk further in some areas, depending on where dew and rain events occur. Continue to growth-stage soybeans and note that map predictions should be considered for making white mold management decisions if soybeans are flowering AND soybean canopies are nearly closed. For more information on white mold and white mold management, see this previous post.
 Figure 1. Apothecial Risk for non-irrigated soybean fields (July 21, 2017) |
 Figure 2. Apothecial Risk for soybeans planted to 15″ rows, under irrigation (July 21, 2017) |
 Figure 3. Apothecial Risk for soybeans planted to 30″ rows, under irrigation (July 21, 2017) |
Map Legend: White = model is inactive and risk of apothecia in the field is likely low; Gray = apothecia might be present, but likelihood of apothecial presence is less than 5%; Blue = low risk of apothecia in the field (5 to <15% chance); Yellow = moderate risk of apothecia in the field (15 to <30% chance); Red = high risk of apothecia in the field (30% or higher chance). Model predictions must be combined with soybean growth stage and canopy characteristics to aid in timing of fungicide sprays.
These models were developed at the University of Wisconsin-Madison in conjunction with Michigan State University and Iowa State University to identify at-risk regions which have been experiencing weather favorable for the development of white mold fungus apothecia. Weather information and maps are provided by the Soybean Integrated Pest Information Platform for Extension and Education (iPIPE), which is managed by ZedX, Inc. This model predicts when apothecia will be present in the field using combinations of 30-day averages of maximum temperature, relative humidity, and maximum wind speed. Using virtually available weather data, predictions can be made in most soybean growing regions. Based on these predictions, a map is generated under three scenarios (non-irrigated soybeans, soybeans planted on 15″ row-spacing and irrigated, or soybeans planted on 30″ row-spacing and irrigated). The maps are colored to show the likelihood of apothecial presence within a region. If the model is predicting high risk (red) in your area for your planting scenario, the soybeans are flowering, and the canopy is somewhat closed, then the white mold risk is elevated. If your fields are at-risk, we recommend to consult your local extension personnel or resources for the best in-season management options for your area For further information on how to use and interpret these risk maps, CLICK HERE to download a how-to guide.
Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin-Madison
Jaime Willbur, Graduate Research Assistant, University of Wisconsin-Madison
Sclero-cast: A Soybean White Mold Prediction Model
**This tool is for guidance only and should be used with other sources of information and professional advice when determining risk of white mold development. We encourage you to read the model how-to guide which can be downloaded by clicking here**
Risk of apothecial presence and subsequent white mold development has increased over the past week in non-irrigated fields (Fig. 1). Cool temperatures and high moisture have increased risk to high levels especially along the southern tier of counties, and into Dodge and Fond du Lac counties. Risk remains high in west-central to northwest portions of Wisconsin and in a band stretching from south-central Wisconsin to northeast Wisconsin.
Areas of high risk have remained steady in irrigated soybeans planted to 15-inch rows (Fig. 2) and 30-inch rows (Fig. 3). Soybeans planted to 15-inch rows and irrigated are under high risk for white mold development in the southern region west-central region and in a band stretching from central to northeast Wisconsin. Risk in irrigated soybeans planted to 30-inch row spacing remains low to moderate.
The Field Crops Pathology crew has also started scouting commercial fields, and research plots, for apothecia. Consistent with the models, we have found apothecia under irrigation on the central sands. We did not find apothecia in dryland environments in the southern tier of the state, where there was low-to-moderate risk expected.
I expect risk to continue to remain steady over the next week, as heat will be accompanied by frequent rain events. Continue to growth-stage soybeans and note that map predictions should be considered for making white mold management decisions if soybeans are flowering AND soybean canopies are nearly closed. For more information on white mold and white mold management, see this previous post.
 Figure 1. Apothecial Risk for non-irrigated soybean fields (July 17, 2017) |
 Figure 2. Apothecial Risk for soybeans planted to 15″ rows, under irrigation (July 17, 2017) |
 Figure 3. Apothecial Risk for soybeans planted to 30″ rows, under irrigation (July 17, 2017) |
Map Legend: White = model is inactive and risk of apothecia in the field is likely low; Gray = apothecia might be present, but likelihood of apothecial presence is less than 5%; Blue = low risk of apothecia in the field (5 to <15% chance); Yellow = moderate risk of apothecia in the field (15 to <30% chance); Red = high risk of apothecia in the field (30% or higher chance). Model predictions must be combined with soybean growth stage and canopy characteristics to aid in timing of fungicide sprays.
These models were developed at the University of Wisconsin-Madison in conjunction with Michigan State University and Iowa State University to identify at-risk regions which have been experiencing weather favorable for the development of white mold fungus apothecia. Weather information and maps are provided by the Soybean Integrated Pest Information Platform for Extension and Education (iPIPE), which is managed by ZedX, Inc. This model predicts when apothecia will be present in the field using combinations of 30-day averages of maximum temperature, relative humidity, and maximum wind speed. Using virtually available weather data, predictions can be made in most soybean growing regions. Based on these predictions, a map is generated under three scenarios (non-irrigated soybeans, soybeans planted on 15″ row-spacing and irrigated, or soybeans planted on 30″ row-spacing and irrigated). The maps are colored to show the likelihood of apothecial presence within a region. If the model is predicting high risk (red) in your area for your planting scenario, the soybeans are flowering, and the canopy is somewhat closed, then the white mold risk is elevated. If your fields are at-risk, we recommend to consult your local extension personnel or resources for the best in-season management options for your area For further information on how to use and interpret these risk maps, CLICK HERE to download a how-to guide.
Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin-Madison
Jaime Willbur, Graduate Research Assistant, University of Wisconsin-Madison
Sclero-cast: A Soybean White Mold Prediction Model
**This tool is for guidance only and should be used with other sources of information and professional advice when determining risk of white mold development. We encourage you to read the model how-to guide which can be downloaded by clicking here**
Risk of apothecial presence and subsequent white mold development has remained steady since last week in non-irrigated fields (Fig. 1). Higher temperatures have offset higher moisture in these drylands situations to keep risk steady. Risk is highest for soybean fields in the west-central to northwest portions of Wisconsin. Risk is also high in a band stretching from south-central Wisconsin to northeast Wisconsin.
The greatest change in risk across the state is in soybeans under irrigation. A significant increase in areas of high risk is predicted in irrigated soybeans planted to 15-inch rows (Fig. 2). Many soybeans planted in this environment are highly likely to see white mold later in the season, if rows are currently closed and soybeans are blooming. Risk has also increased for soybeans under irrigation and planted in 30-inch rows (Fig. 3). Pockets of high risk exist in Jackson, Trempealeau, and Crawford counties if under irrigation and planted to 30-inch rows.
I expect risk to continue to remain high, or increase in some areas, if humidity remains high and timely rains fall. Continue to growth stage soybeans and note that map predictions should be considered for making white mold management decisions if soybeans are flowering and soybean canopies are nearly closed. For more information on white mold and white mold management, see this previous post.
 Figure 1. Apothecial Risk for non-irrigated soybean fields (July 11, 2017) |
 Figure 2. Apothecial Risk for soybeans planted to 15″ rows, under irrigation (July 11, 2017) |
 Figure 3. Apothecial Risk for soybeans planted to 30″ rows, under irrigation (July 11, 2017) |
These models were developed at the University of Wisconsin-Madison in conjunction with Michigan State University and Iowa State University to identify at-risk regions which have been experiencing weather favorable for the development of white mold fungus apothecia. Weather information and maps are provided by the Soybean Integrated Pest Information Platform for Extension and Education (iPIPE), which is managed by ZedX, Inc. This model predicts when apothecia will be present in the field using combinations of 30-day averages of maximum temperature, relative humidity, and maximum wind speed. Using virtually available weather data, predictions can be made in most soybean growing regions. Based on these predictions, a map is generated under three scenarios (non-irrigated soybeans, soybeans planted on 15″ row-spacing and irrigated, or soybeans planted on 30″ row-spacing and irrigated). The maps are colored to show the likelihood of apothecial presence within a region. White areas indicate the model is inactive and risk of apothecia in the field is likely low. Gray areas indicate that apothecia might be present, but likelihood of apothecial presence is less than 5%. Blue indicates a low risk (5 to <15% chance), yellow a moderate risk (15 to <30% chance), and red areas indicate a high risk (30% or higher chance). Model predictions must be combined with soybean growth stage and canopy characteristics to aid in timing of fungicide sprays. If the model is predicting high risk (red) in your area for your planting scenario, the soybeans are flowering, and the canopy is somewhat closed, then the white mold risk is elevated. If your fields are at-risk, we recommend to consult your local extension personnel or resources for the best in-season management options for your area For further information on how to use and interpret these risk maps, CLICK HERE to download a how-to guide.
