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
- Integrated Pest Management Options
- Foliar Treatment
- Coniothyrium minitans - Contans WG
- Bacillus subtilis - Serenade ASO
- 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 www.gosoy.ca
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. |
Related links...
