Winter wheat character notes - Yellow rust diversification scheme

Yellow rust can spread between wheat varieties that are susceptible to the same race of the pathogen.

The risk of severe and widespread infection may be reduced by:

Choosing varieties to grow together

  1. Select a first-choice variety and find its Diversification Group (DG).

  2. Go to the selection matrix and find this DG under 'Chosen DG' on the left hand side of the table.

  3. Read across the table to find the risk of disease spread for each companion DG.

    1. VH = Very high risk of spread of yellow rust

    2. H = High risk of spread of yellow rust

    3. L = low risk of spread of yellow rust

  4. Wherever possible choose combinations of varieties marked 'L' .

  5. If there is a choice of varieties in a companion DG, give preference to those with higher resistance ratings.

 

Choose the Diversification Group (DG) for each of two varieties. Click on the DG group of one of the varieties and see the risk of yellow rust spreading  between the two varieties.

As an example, Malacca is in DG1 and Consort in DG7. The table will show that there is a low risk of yellow rust spreading between these two varieties.

Since Robigus and Consort are both in DG7, there is a high risk of yellow rust spreading between the two varieties.

DG1

 DG2a DG2b

DG3

DG0

Alchemy

Battalion Gallant

Cordiale

Glasgow

Beluga Conqueror Ketchum Grafton  
Cassius Duxford Oakley Kingdom **  
Claire Einstein Robigus    

Gladiator

Hereward

Solstice

 

 

Istabraq

Humber

Viscount

   
KWS Sterling

Marksman

 

   
Panorama

Qplus

 

 

 

Scout

    

 

 

Warrior

    

 

Unclassified *

Xi19

    

 

Invicta

Zebedee

    

 

JB Diego

* = risk of spread to varieties in other DGs unknown. Further tests in progress.
** = provisional classification

Chosen DG
1
2a
2b
3
0
1
L
L
L
L
L
2a
L
H
H
L
H
2b
L
H
VH
L
H
3
L
L
L
H
H
0
L
H
H
H
H


Risk of yellow rust spreading from one variety to another

Key

L Low risk of yellow rust spreading between the varieties
H High risk of yellow rust spreading between the varieties
VH Very high risk of yellow rust spreading between the varieties

 

Spring wheat

Varieties are no longer allocated to DGs.

For purposes of diversification, spring wheat varieties with resistance ratings of 7, 8 or 9 can be regarded as belonging to DG1.

Other varieties are unlikely to contribute to diversification.