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New "Sporecaster" App Assists Farmers in Making Early Season Management Decisions for White Mold
Tue - May 22, 2018
by Damon Smith, Roger Schmidt, and Shawn Conley, University of Wisconsin, Madison

"Sporecaster" is a new smartphone application designed to help farmers predict the need for a fungicide application to control white mold in soybean.

The best time to spray fungicides for white mold is during flowering (R1 and R3 growth stages) when apothecia are present on the soil surface. Apothecia are small, mushroom-like structures which release spores that infect senescing soybean flowers, leading to the development of white mold.

University research has indicated that the appearance of apothecia can be predicted using several variables including weather and the amount of soybean row closure in a field. Based on this research, Sporecaster models have been developed to forecast the risk of apothecia being present. You will need to scout your field to determine if the soybean crop meets thresholds such as canopy closure and the presence of flowers.

Android install:
Apple install:

For more information on how to use the app, including video tutorials, see “New smartphone app: Sporecaster, The Soybean White Mold Forecaster” from the University of Wisconsin.

The app, which is free to use, was developed with checkoff support from the Wisconsin Soybean Association, Wisconsin Soybean Marketing Board, the Michigan Soybean Promotion Board, the United Soybean Board, and the North Central Soybean Research Program. It was programmed by personnel in the UW-Madison Nutrient and Pest Management Program.

apothecia of S. sclerotiorumWhite Mold Management Resources
White Mold - NCSRP and Crop Protection Network
Scouting for White Mold - NCSRP and Crop Protection Network
Scouting for Soybean Stem Diseases - NCSRP and Crop Protection Network, 2015
Scouting for Soybean Stem Diseases trifold version, 2015
Fungicide Efficacy for Control of Soybean Foliar Diseases - North Central Regional Committee on Soybean Diseases (NCERA 137). Updated June 2018

Apothecia of Sclerotinium sclerotorium, the white mold pathogen