Disease management

Fungicide application guide

Fungicide application guide*

by variety, disease**, risk, critical period*** and rainfall (>400mm and <400mm)

Critical period ***

Digger, Nugget,

Tiara, Aldinga, Matilda, Cobber

Northfield

First

(10-14 WAE)

> 400 mm only

• If BGM risk high 1, 2, 3, 4 *

> 400 mm only

• If BGM risk med/high 1, 2, 3, 4 * 

All rainfalls

• If BGM risk med/high 1, 2, 3, 4 * 

All rainfalls

• BGM risk is med/high 1, 2, 3, 4 * 

Second

(14-16 WAE)

> 400 mm only

  • If BGM risk is very high 1, 2, 3, 4

> 400 mm

  • If AB present + BGM risk low 3, 4
  • If AB present + BGM risk high 5, 6, 7, 8, 3, 4
  • If AB absent and risk is low + BGM risk high 1, 2

 

< 400 mm

  • If AB risk 1, 2

> 400 mm

  • If AB present + BGM risk low 3, 4
  • If AB present + BGM risk
  • med/high 5, 6, 7, 8, 3, 4
  • If AB absent and risk low + BGM risk med/high 1, 2, 3, 4

 

< 400 mm

  • If AB risk 1, 2

> 400 mm

  • If BGM risk med 1, 2, 3, 4
  • If BGM risk high 1, 2
  • Monitor, as more than one fungicide application may be required for BGM prior to the end of flowering (critical period 3)

 

< 400 mm

  • If BGM risk med/high 1, 2, 3, 4

Third

(16-18 WAE)

-

> 400 mm only

• If AB present and risk high 3, 4

> 400 mm only

• If AB present and risk high 3, 4

> 400 mm only

• If BGM present 1, 2, 3, 4

 

* Fungicides: 1 = carbendazim; 2 = procymidone; 3 = chiorothaionil; 4 = mancozeb; 5 = 1+3, 6 = 1+4, 7 = 2+3, 8 = 2+4 (see Fungicide efficacy and use under Disease Management for efficacies)

** AB = Ascochyta blight and BGM = Botrytis grey mould

*** WAE = weeks after emergence (see Fungicide spraying program under Disease Management for critical periods)