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Cereals: Wheat: Tan Spot (Pyrenophora
tritici-repentis)
Pub 812: Field Crop Protection
Guide > Chapter
4: Cereals > Wheat: Tan Spot
Field Crop Protection Guide 2011-2012, Order
2011-2012 publication
Table of Contents
- Integrated Pest Management Options
- pyraclostrobin Headline EC
- azoxystrobin + propiconazole - Quilt
- propiconazole Tilt 250 E, Bumper 418 EC
- prothioconazole - Proline 480 SC
- tebuconazole Folicur 250 EW, Folicur 432 F
- trifloxystrobin + propiconazole Stratego 250 EC
- mancozeb Dithane DG, Rainshield NT
- prothioconazole + tebuconazole - Prosaro 250 EC
- Related links...
Integrated Pest Management Options
Reduced tillage and cool, cloudy, humid weather promotes this disease.
Tan spot survives in crop residues. Avoid planting wheat in conservation
tillage fields in which wheat was grown during the preceding 2 yr.
See Appendix J,
Cereal Growth Stages, on page 136.
| Active ingredient |
pyraclostrobin |
| Trade name |
Headline EC |
| Rate per hectare (product) |
300-600 mL per ha |
| Rate per acre (product) |
121-240 mL per ac |
| PHI* |
Do not apply at boot stage and beyond. |
| Comments |
Ground and aerial application. Apply only up to
flag leaf fully emerged stage (Zadok's 39). Do not apply at
boot stage (Zadok's 47) and beyond. Maximum 2 applications/yr.
12-hr re-entry period. |
| Active ingredient |
azoxystrobin + propiconazole |
| Trade name |
Quilt |
| Rate per hectare (product) |
750 mL per ha |
| Rate per acre (product) |
305 mL per ac |
| PHI* |
Do not apply at boot stage and beyond. |
| Comments |
Ground and aerial application. Apply only up to flag leaf
fully emerged stage (Zadok's 39). Do not apply at boot stage
(Zadok's 47) and beyond. Maximum 1application/yr. 12-hr re-entry
period. |
| Active ingredient |
propiconazole |
| Trade name |
Tilt 250 E |
| Rate per hectare (product) |
250-500 mL per ha |
| Rate per acre (product) |
100-200 mL per ac |
| PHI* |
45 |
| Comments |
Ground and aerial application. Early application at Zadok's
1223. Use low rate for early-season disease suppression.
Use higher rate for field with high disease pressure history
or field conditions favourable for disease development. Later
application at first sign of disease (Zadok's 2937) or
before head is half emerged (Zadok's 4955). Apply only
the high rate on any application from Zadok's 2955. Maximum
2 applications/yr. |
| Active ingredient |
propiconazole |
| Trade name |
Bumper 418 EC |
| Rate per hectare (product) |
150-300 mL per ha |
| Rate per acre (product) |
60-121 mL per ac |
| PHI* |
45 |
| Comments |
Ground and aerial application. For early-season disease suppression,
use the lower at Zadok's 12-23 (as early as the two leaf stage).
Use the high rate for field with a history of disease pressure.
For later-season application, apply at early signs of disease
from the beginning of stem elongation (Zadok's 29-37). If
conditions favourable to disease continue, apply again, if
necessary, before head is half emerged (Zadok's 49-55). Apply
only the high rate from Zadok's 29-55. Maximum 2 applications/yr.
|
| Active ingredient |
prothioconazole |
| Trade name |
Proline 480 SC |
| Rate per hectare (product) |
315 mL per ha |
| Rate per acre (product) |
128 mL per ac |
| PHI* |
30 |
| Comments |
Ground application only. Use as a preventative
when earliest disease symptoms appear on the leaves and stems.
Recommended to be used with the registered non-ionic surfactant,
Agral 90 or AgSurf at 0.125% vol/vol. Minimum 7-day interval
between applications. Maximum 2 applications/yr. 24-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* |
36 |
| Comments |
Ground and aerial application. Apply to leaf foliage at the
first sign or very early stage of disease, especially if weather
conditions are conducive to disease development, up to the
end of the flowering stage. Use the higher rate when weather
conditions are conducive to heavy disease development. The
use of a non-ionic surfactant (Agral 90 or Agsurf) is NOT
required as it is built into the formulation. Use a minimum
of 100 L/ha of water for ground application, 47 L/ha of water
for aerial application. Maximum 1 application/yr. 12-hr re-entry
period.
Before using Folicur for wheat leaf diseases, consider
that Folicur can only be applied once per year and has been
traditionally used for Fusarium control, where applications
are targeted at head emergence.
|
| 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* |
36 |
| Comments |
Ground and aerial application. Apply to leaf foliage at the
first sign or very early stage of disease, especially if weather
conditions are conducive to disease development, up to the
end of the flowering stage. Use the higher rate when weather
conditions are conducive to heavy disease development. Use
non-ionic surfactant such as Agral 90 or Agsurf at 0.125%
vol/vol. Use a minimum of 100 L/ha of water for ground application,
47 L/ha of water for aerial application. Maximum 1 application/yr.
12-hr re-entry period.
Before using Folicur for wheat leaf diseases, consider
that Folicur can only be applied once per year and has been
traditionally used for Fusarium control, where applications
are targeted at head emergence.
|
| Active ingredient |
trifloxystrobin + propiconazole |
| Trade name |
Stratego 250 EC |
| Rate per hectare (product) |
500 mL per ha |
| Rate per acre (product) |
200 mL per ac |
| PHI* |
Do not apply at boot stage and beyond. |
| Comments |
Ground and aerial application. Do not apply the second application
within 14 days of the first. Apply only up to flag leaf fully
emerged stage (Zadok's 39). Do not apply at boot stage (Zadok's
47) and beyond. Can be tank-mixed with Buctril M in wheat. Maximum
2 applications/yr/ 12-hr re-entry period. |
| Active ingredient |
mancozeb |
| Trade name |
Dithane DG |
| Rate per hectare (product) |
Early: 1.1 kg per ha |
| Rate per acre (product) |
Early: 440 g per ac |
| Rate per hectare (product) |
Late: 2.25 kg per ha |
| Rate per acre (product) |
Late: 900 g per ac |
| PHI* |
40 |
| Comments |
Use lower rate for applications at Zadok's 12-21 growth stage,
when crop is in 3rd leaf to tillering. Higher rate
for applications at Zadok's 59 growth stage when head is fully
emerged but prior to flowering. Do not graze crop or cut for
hay. Maximum 2 applications/yr. |
| Active ingredient |
mancozeb |
| Trade name |
Rainshield NT |
| Rate per hectare (product) |
Early: 1.1 kg per ha |
| Rate per acre (product) |
Early: 440 g per ac |
| Rate per hectare (product) |
Late: 2.25 kg per ha |
| Rate per acre (product) |
Late: 900 g per ac |
| PHI* |
40 |
| Comments |
Use lower rate for applications at Zadok's 12-21 growth stage,
when crop is in 3rd leaf to tillering. Higher rate
for applications at Zadok's 59 growth stage when head is fully
emerged but prior to flowering. Do not graze crop or cut for
hay. Maximum 2 applications/yr. |
| Active ingredient |
prothioconazole + tebuconazole |
| Trade name |
Prosaro 250 EC |
| Rate per hectare (product) |
800 mL per ha |
| Rate per acre (product) |
324 mL per ac |
| PHI* |
36 |
| Comments |
Ground and aerial application. Use a minimum of 100 L/ha of
water for ground application, 50 L/ha of water for aerial application.
Maximum 1 application/yr. 12-hr re-entry period. |
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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