Cereals: Wheat: Stagonospora
Glume Blotch (Stagonospora nodorum)


Pub 812: Field Crop Protection Guide > Chapter 4: Cereals >
Wheat: Septoria (Stagonospora) Glume Blotch

Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

  1. Description
  2. Integrated Pest Management Options
    • prothioconazole + tebuconazole - Prosaro 250 EC
    • prothioconazole - Proline 480 SC
    • tebuconazole - Folicur 250 EW, Folicur 432 F
    • chlorothalonil – Bravo 500
    • propiconazole – Tilt 250 E, Bumper 418 EC
  3. Related links...

Description

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.

Plate 119. Septoria glume appears as small, oval, grey-to-brown spots on the leaves and purplish-brown areas on the glumes.

Septoria glume appears as small, oval, grey-to-brown spots on the leaves and purplish-brown areas on the glumes.


Integrated Pest Management Options

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 J, Cereal Growth Stages, on page 136.

 
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 prothioconazole
Trade name Proline 480 SC
Rate per hectare (product) 315-420 mL per ha
Rate per acre (product) 128-170 mL per ac
PHI* 30
Comments 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. 24-hr re-entry period.

 

 
Active ingredient tebuconazole
Trade name Folicur 250 EW
Rate per hectare (product) 500 mL per ha
Rate per acre (product) 200 mL per ac
PHI* 36
Comments

Ground and aerial application. 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). 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) 292 mL per ha
Rate per acre (product) 18 mL per ac
PHI* 36
Comments

Ground and aerial application. 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 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 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
PHI* 30
Comments Ground and aerial application. 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.

 

 
Active ingredient propiconazole
Trade name Tilt 250 E
Rate per hectare (product) 500 mL per ha
Rate per acre (product) 200 mL per ac
PHI* 45
Comments Ground and aerial application. Apply at early signs of the disease from the beginning of stem elongation (Zadok's 29-37). If conditions favourable to diseas continue, apply agian, if necessary, before head is half emerged (Zadok's 49-55). Can be tank-mixed with several cereal herbicides. Maximum 2 applications/yr.

 

 
Active ingredient propiconazole
Trade name Bumper 418 EC
Rate per hectare (product) 300mL per ha
Rate per acre (product) 121 mL per ac
PHI* 45
Comments Ground and aerial application. Apply at early signs of the disease from the beginning of stem elongation (Zadok's 29-37). If conditions favourable to diseas continue, apply agian, if necessary, before head is half emerged (Zadok's 49-55). Can be tank-mixed with several cereal herbicides. Maximum 2 applications/yr.

 


Related links...

 


For more information:
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E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 17 May 2011