|
|
Cereals: Wheat: Septoria
Leaf Spot (Septoria tritici)
Pub 812: Field Crop Protection
Guide > Chapter
4: Cereals > Wheat: Late-Season Septoria Spp. (Glume Blotch
and Leaf Spot)
Field Crop Protection Guide 2011-2012, Order
2011-2012 publication
Table of Contents
- Description
- Integrated Pest Management Options
- pyraclostrobin – Headline EC
- azoxystrobin + propiconazole - Quilt
- propiconazole – Tilt 250 E
- propiconazole – Bumper 418 EC
- prothioconazole - Proline 480 SC
- tebuconazole – Folicur 250 EW, Folicur 432 F
- Prothioconazole + tebuconazole - Prosaro 250 EC
- mancozeb – Dithane DG, Rainshield NT
- Related links...
Description
Septoria leaf spot attacks only leaves, whereas Stagonospora glume
blotch appears on the leaves and glumes. Initial infections from
Septoria leaf spot appear as small, light green-to-yellow spots
between the veins of the lower leaves. These spots elongate to form
irregular reddish-brown lesions. Embedded in these lesions are small,
dark brown-to-black fungal bodies (pycnidia) that can be seen easily
with the use of a hand lens.
Septoria leaf spot appears as small, light green-to-yellow
spots that elongate to form reddish-brown lesions.
Integrated Pest Management Options
Foliar Treatment
Wet, windy weather and moderate temperatures favour the development
of this disease. Destroying volunteer wheat, reducing crop residue
and crop rotation can help reduce risk of infection. Plant less
susceptible varieties. Consult with your seed company and the Ontario
Cereal Crops Committee Variety Trials Results at www.gocereals.ca
for variety profiles.
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) |
120-240 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/season. Tank-mixing
with insecticide is not recommended, as this fungicide could
affect insecticide efficacy. |
| 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 1 application/yr. Do not harvest
for forage. 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
12-23. 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 29-37) or before head is half
emerged (Zadok's 49-55). Apply only the high rate on any application
from Zadok's 29-55. 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 rate at Zadok's 12-23 (as
early as the two leaf stage). Use the high rate for fields with
a history of disease pressure. For later-season application,
apply at eary signs of the 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) |
128mL 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. Maximum 2 applications/yr
with a minimum 7-day interval between applications. Do not apply
within 30 days of harvest. |
| 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 control of 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. Always yse 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 control of 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 |
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.
|
| 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. |
Related links...
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
|
