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Cereals:
Wheat: Stagonospora
|
| Author: | OMAFRA Staff |
|---|---|
| Creation Date: | 04 July 2005 |
| Last Reviewed: | 28 July 2007 |
| Pub
812: Field Crop Protection Guide > Chapter
5: Cereals > Wheat: Septoria (Stagonospora) Glume Blotch |
Excerpt from Chapter 5, 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. Rotation with crops other than cereals, plowing down of
cereal residues and removal of volunteer wheat reduces survivability
of the fungi.
See Appendix G, on page 85, for Zadok's cereal growth stages.
| 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
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
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, another
application will be necessary. A second spray may be applied before
head is half emerged (Zadok's
49-55). Can be tank-mixed with several cereal herbicides. 45 days
to harvest.
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