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.

    High = high risk of spread of yellow rust

    Mod = moderate risk of spread of yellow rust

    Low = low risk of spread of yellow rust

Wherever possible choose combinations of varieties marked '+' but a combination marked 'y' is a lower risk than one marked 'Y'.

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.

(WYR6,17)

DG1

DG3

DG4 DG7

DG10

DG11

DG0

Alchemy

(WYR13)

(WYR7) (WYR CV+ )

(WYR6)

Battalion

Glasgow

Brompton

Riband

Cordiale Consort

(WYR6,17;

Marksman

Soissons

Claire

 

  Hereward

WYR6,9,17)

 

 

Deben

 

  Robigus

Ambrosia

 

 

Gatsby

 

   

Einstein

 

Unclassified*

Gladiator

 

   

Hyperion

 

Duxford

Humber

 

   

Mascot

 

 

Istabraq

 

   

Oakley

 

 

JB Diego

 

   

Welford

 

 

Malacca

 

   

 

 

 

Nijinsky

 

   

 

 

 

Solstice

 

   

 

 

 

Timber

 

   

 

 

 

Xi19

 

   

 

 

 

Zebedee

 

   

 

 

 

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

Chosen DG
1
3
4
7
10
11
0
1
+
+
+
+
+
+
+
3
+
Y
+
y
y
y
Y
4
+
+
Y
+
+
+
Y
7
+
y
+
Y
+
y
Y
10
+
y
+
+
Y
y
Y
11
+
y
+
y
y
Y
Y
0
+
Y
Y
Y
Y
Y
Y


Risk of yellow rust spreading from one variety to another

Key

Low Low risk of yellow rust spreading between the varieties
Mod Moderate risk of yellow rust spreading between the varieties
High 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.