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Soybeans: Frogeye Leaf
Spot (Cercospora sojina)
Pub 812: Field Crop Protection
Guide > Pub 812:
Soybeans > Frogeye Leaf Spot
Field Crop Protection Guide 2011-2012, Order
2011-2012 publication
Table of Contents
- Integrated Pest Management Options
- Foliar Treatment
- pyraclostrobin – Headline EC
- trifloxystrobin + propiconazole - Stratego 250 EC
- tebuconazole - Folicur 250 EW, Folicur 432 F
- prothioconazole - Proline 480 SC
- propiconazole – Bumper 418 EC
- propiconazole – Tilt 250 E
- Bacillus subtilis - Serenade ASO
- Related links...
Integrated Pest Management Options
Foliar Treatment
The economic impact of this disease is minimal. Frogeye leaf spot
occurs under hot, humid conditions particularly on very susceptible
varieties. Consult with your seed company and the Ontario Oil and
Protein Seed Crop Committee Variety Trial Results at www.gosoy.ca
for variety profiles. This disease is most frequent in the extreme
southwest counties.
| Active ingredient |
pyraclostrobin |
| Trade name |
Headline EC |
| Rate per hectare (product) |
400-600 mL per ha |
| Rate per acre (product) |
160-240 mL per ac |
| PHI* |
21 |
| Comments |
Ground and aerial application. First application should be
applied at the first sign of disease followed by the second
application 14 days after, if environmental conditions are favourable
for disease development. Maximum 2 applications/yr. 12-hr re-entry
period. |
| Active ingredient |
trifloxystrobin |
| Trade name |
Stratego 250 EC |
| Rate per hectare (product) |
500 mL per ha |
| Rate per acre (product) |
200 mL per ac |
| PHI* |
20 |
| Comments |
Ground and aerial application. Spray between R3 and R4 (early
pod fill) or when first symptoms appear. Use 100-200 L/ha of
water for ground application, 50 L/ha for aerial application.
Maximum 2 appplications/yr. 12-hr re-entry period. |
| 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 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 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 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 |
prothioconazole |
| Trade name |
Proline 480 SC |
| Rate per hectare (product) |
210 mL per ha |
| Rate per acre (product) |
85 mL per ac |
| PHI* |
20 |
| Comments |
Ground application only. Apply when first
symptoms of disease can be found or when risk of infection is
imminent. Maximum 1 application/yr. 12-hr re-entry period. |
| Active ingredient |
propiconazole |
| Trade name |
Bumper 418 EC |
| Rate per hectare (product) |
300-455 mL per ha |
| Rate per acre (product) |
121-184 mL per ac |
| PHI* |
50 |
| Comments |
For use on soybeans grown for seed only. Ground
application only. Apply when disease first appears.
Under severe disease pressure, make a second application 14
days after. Harvested soybean seed should not be used for human
food or animal feed. |
| Active ingredient |
propiconazole |
| Trade name |
Tilt 250 E |
| Rate per hectare (product) |
500-760 mL per ha |
| Rate per acre (product) |
200-308 mL per ac |
| PHI* |
30 |
| Comments |
Ground application only. Apply
when disease symptoms first appear. Under severe disease pressure,
make a second application 14 days after. Harvested soybean seed
should not be used for human food or animal feed. |
| Active ingredient |
bacillus subtilis |
| Trade name |
Serenade ASO |
| Rate per hectare (product) |
1.0-4.0 L per ha |
| Rate per acre (product) |
0.4-1.6 L per 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...
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
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