In This Section |
Cereals: Wheat: Stagonospora
|
| Author: | OMAFRA Staff |
|---|---|
| Creation Date: | 04 July 2005 |
| Last Reviewed: | 15 June 2009 |
| Pub
812: Field Crop Protection Guide > Chapter
4: Cereals > Wheat: Septoria (Stagonospora) Glume Blotch |
Excerpt from Chapter 4, Field Crop Protection Guide, Order this publication
Stagonospora glume blotch develops after the heads emerge and is favoured in warm, humid conditions. Small, oval, irregular, grey-to-brown spots appear on the leaves and purplish-brown areas on the glumes. The affected areas are also speckled with small black pycnidia. The presence of pycnidia is an important diagnostic feature that aids in distinguishing Septoria leaf spot and Stagonospora glume blotch from other leaf spot diseases.
Septoria glume appears as small, oval, grey-to-brown spots on the leaves and purplish-brown areas on the glumes.
Prolonged wet periods in May and early June result in increased disease
incidence. Rotate with crops other than cereals, plow down cereal residues
and remove volunteer wheat to reduce survivability of the fungi.
See Appendix F, Cereal Growth Stages, on page 91.
| Active ingredient | chlorothalonil |
|---|---|
| Trade name | Bravo 500 |
| Rate per hectare (product) | 1.5-2.5 mL per ha |
| Rate per acre (product) | 0.6-1.0 L per ac |
Comments (Days to harvest, label precautions, etc.)
Apply at Zadok's growth
stage 37 (flag leaf emergence) and repeat 10-14 days later at growth
stage 51-55 (visible ear). A 3rd application at growth
stage 59-69 (ear fully emerged) may be necessary if conditions favour
disease spread. Maximum 3 applications/yr. 30 days to harvest.
Comments (Days to harvest, label precautions, etc.)
Ground and aerial 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). Can be tank-mixed with several cereal herbicides. 45 days
to harvest.
| Active ingredient | prothioconazole |
|---|---|
| Trade name | Proline |
| Rate per hectare (product) | 315–420 mL per ha |
| Rate per acre (product) | 128–170 mL per ac |
Comments (Days to harvest, label precautions,
etc.)
Ground application only. Timing of application is critical.
Apply from when at least 75% of the wheat heads on the main stem are fully
emerged (Zadok’s 59)
to when 50% of the heads on the main stem are in flower (Zadok’s
65). Use higher rate when expecting high disease pressure. Recommended
to be used with the registered non-ionic surfactant, Agral 90 or AgSurf
at 0.125% vol/vol. Maximum 2 applications/yr (735 mL/ha) with a minimum
7-day interval between applications. Do not apply within 30 days of harvest.
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