Soybeans: Powdery Mildew
(Microsphaera diffusa)
Pub 812: Field Crop Protection
Guide >
Pub 812:
Soybeans > Powdery Mildew
Field Crop Protection Guide 2011-2012, Order
2011-2012 publication
Table of Contents
- Integrated Pest Management Options
- tebuconazole - Folicur 250 EW, Folicur 432 F
- propiconazole - Tilt 250 E
- azoxystrobin - Quadris
- azoxystrobin + propiconazole - Quilt
- Related Links...
Integrated Pest Management Options
This disease is most noticeable when conditions are wet or humid.
Powdery mildew develops on the leaves, usually in August and September.
Outbreaks arise when disease symptoms begin in early July and the
environmental conditions remain cool, cloudy and humid through to
pod fill. Removal of crop residue and rotation with non-host crops,
such as corn and wheat, will help prevent both diseases.
| Active ingredient |
tebuconazole |
| Trade name |
Folicur 250 EW |
| Rate per hectare (product) |
375-500 mL per ha |
| Rate per acre (product) |
152-200 mL per ac |
| PHI* |
20 |
| Comments |
Ground and aerial application. Apply when first symptoms of
disease can be found or when risk of infection is imminent.
Use the higher rate when disease pressure is severe. Use a minimum
of 100 L/ha of water for ground application, 47 L/ha of water
for aerial application. The use of a non-ionic surfactant (Agral
90 or Agsurf) is NOT required as it is built into the formulation.
Maximum 1 application/yr. 12-hr re-entry period. |
| Active ingredient |
tebuconazole |
| Trade name |
Folicur 432 F |
| Rate per hectare (product) |
220-292 mL per ha |
| Rate per acre (product) |
90-118 mLper ac |
| PHI* |
20 |
| Comments |
Ground and aerial application. Apply when first symptoms of
disease can be found or when risk of infection is imminent.
Use the higher rate when disease pressure is severe. Use a minimum
of 100 L/ha of water for ground application, 47 L/ha of water
for aerial application. Always use a non-ionic surfactant such
as Agral 90 or Agsurf at 0.125% vol/vol. Maximum 1 application/yr.
12-hr re-entry period. |
| Active ingredient |
propiconazole |
| Trade name |
Tilt 250 E |
| Rate per hectare (product) |
500 mL per ha |
| Rate per acre (product) |
200 mLper ac |
| PHI* |
30 |
| Comments |
Ground and aerial application. First application
should be made at the first sign of disease, followed by a second
application 14 days after the first application, if environmental
conditions are favourable for disease development. Good spray
coverage and canopy penetration are important for best results.
See label for resistance management strategy. Maximum 2 applications/yr. |
| Active ingredient |
azoxystrobin |
| Trade name |
Quadris |
| Rate per hectare (product) |
500 mL per ha |
| Rate per acre (product) |
200 mLper ac |
| PHI* |
15 |
| Comments |
Ground and aerial application. See label for resistance management
strategy. Maximum 2 applications/yr. Re-entry possible once
residues have dried. |
| Active ingredient |
azoxystrobin |
| Trade name |
Quilt |
| Rate per hectare (product) |
1.0 L per ha |
| Rate per acre (product) |
400 mLper ac |
| PHI* |
30 |
| Comments |
Ground and aerial application. First application should be
made at the first sign of disease, followed by a second application
14 days after the first application, if environmental conditions
are favourable for disease development. Good spray coverage
and canopy penetration are important for best results. See label
for resistance management strategy. Maximum 2 applications/yr. |
Related links...
