Cereals: Barley: Powdery Mildew (Erysiphe graminis)


Pub 812: Field Crop Protection Guide > Chapter 4: Cereals > Barley: Powdery Mildew

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

Table of Contents

  1. Foliar, Stem and Head Diseases
      • propiconazole – Bumper 418 EC
      • tebuconazole - Folicur 250 EW, Folicur 432 F
      • trifloxystrobin + propiconazole - Stratego 250 EC
      • prothioconazole + tebuconazole - Prosaro 250 EC
  2. Related links...

Foliar, Stem and Head Diseases

Foliar fungicide applications may be necessary if disease levels will result in yield losses and susceptible variety has been used. Consult with your seed company and the Ontario Cereal Crops Committee Variety Trial Results at www.gocereals.ca for variety profiles.

 
Active ingredient propiconazole
Trade name Bumper 418 EC
Rate per hectare (product) 300 mL per ha
Rate per acre (product) 121 mL per ac
PHI* 45
Comments For use in spring barley only. 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). Maximum 2 applications/yr.

 

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 at the very early stages of disease development. Use higher rate when disease pressure is severe. 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 at the very early stages of disease development. Use higher rate when disease pressure is severe. 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. Maximum 2 applications/yr. 12-hr re-entry period.

 

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