White Mold Management in Soybeans

In BASF’s Plant Health Series recent video, Kurt Maertens explains white mold management in soybeans.

White mold, also known as sclerotia, is a common fungal disease called Sclerotinia stem rot that is present across the Midwest. Infections typically take place in late June/early July, so it’s important to be on the lookout.

Infected plants will show white micellular growth on the stem of the plant near the node, where the infection took place. This infection produces sclerotia, a dark structure on the stem of the plant and will grow inside the stem. The sclerotia is the survival structure of the disease during the winter, and in the spring, a mushroom-type structure will protrude out of the sclerotia and release millions of spores into the air. This can infect adjacent plants, and so on.

Sclerotia is a long-term disease, which can be viable in the soil for up to 10 years. It can be a devasting disease if infections are severe enough, causing a loss of 40-50% of yield potential. Because of this, it’s important to have a strong management plan in order to prevent and treat this disease. Some important management options include:

1. Variety Selection. Choose a soybean variety that has good tolerance to white mold infection

2. Sanitation. Avoid moving sclerotia from field to field by sanitizing harvesting and tillage equipment

3. Row Spacing. Plant wider row soybeans to allow for better airflow between canopies of soy fields

4. Chemical Control. Consider a two-pass fungicide program for white mold control

A recommendation for an effective fungicide program is the combination of BASF’s Endura and Priaxor. Apply 8 ounces of Endura at R1 timing, or beginning of bloom, which offers growers a unique mode of action with superior disease control. Follow up with an application of 4 ounces of Priaxor at R3 timing, designed to consistently protect crops from a variety of fungi and other stresses.

To learn more about how BASF fungicides work in your backyard, visit RevXFields.com