Soybeans: White Mould (Sclerotinia sclerotiorum)

Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > White Mould

Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

  1. Integrated Pest Management Options
    • Foliar Treatment
      • Coniothyrium minitans - Contans WG
      • Bacillus subtilis - Serenade ASO
    1. Related Links...


Integrated Pest Management Options

Foliar Treatment

White mould is a sporadic disease that thrives under cool, wet conditions during flowering or near harvest. Fields at risk have a history of white mould, good leaf growth, and high populations and more than 48 hrs of continuous wetness and air temperatures between 15°C and 20°C (day and night average temperatures).

In fields with a history of white mould, use non-host crops and avoid growing other host crops such as canola, edible beans, buckwheat and sunflowers for 2-3 yrs. Plant a tolerant variety, although none are tolerant (immune), select a variety with good lodging resistance and keep sclerotia on the surface through conservation tillage practices. Consult with your seed company and the Ontario Oil and Protein Seed Crop Committee Variety Trial Results at for variety profiles.

Active ingredient Coniothyrium minitans
Trade name Contans WG
Rate per hectare (product) 0.5-4 kg per ha
Rate per acre (product) 0.20-1.6 kg per ac
PHI* 0
Comments Provides suppression only. Ground application only. Good option for organically grown soybeans. This product should be applied at least 3 months prior to anticipated outbreak (i.e., prior to planting). Product should be incorporated as thoroughly as possible to a depth of 5-20 cm. Rate should be increased to 2-4 kg/ha (0.8-1.6 kg/acre) if incorporated to a depth greater than 5 cm. A post-harvest application may be applied in the fall to treat the soil prior to spring planting of a susceptible crop. Treated soils in the fall should not be disturbed to avoid bringing untreated sclerotia from lower soil layers to the top soil layer. Maximum 2 applications/yr.


Active ingredient Bacillus subtilis
Trade name Serenade ASO
Rate per hectare (product) 4.0-15.0 L per ha
Rate per acre (product) 1.6-6.0 Lper ac
PHI* 0
Comments Provides suppression only. Ground and aerial application. Good option for organically grown soybeans. Under conditions of moderate to high disease pressure, use the higher rate and shorter application intervals. For maximum effectiveness, apply prior to, or at the early stages of disease development. Apply in sufficient water volume to ensure full coverage for effective control. Repeat as necessary on a 7-10 day interval.


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Toll Free: 1-877-424-1300
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 12 May 2011