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United States Department of Agriculture

Agricultural Research Service

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Codes used in wheat leaf rust survey databases
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State - state from which collection was made (2 letter postal abbreviation)

County - county from which collection was made

Race - race codes are assigned according to the following:

Code for North American differential hosts for Puccinia triticina in ordered sets of four.


 Infection type produced on near isogenic Lr Lines**


Host set 1

1

2a

2c

3

Host set 2

9

16

24

26

Host set 3

3ka

11

17

30

Host set 4

B

10

14a

18

Race code*

Host set 5

21

28

41

42


B

L

L

L

L

C

L

L

L

H

D

L

L

H

L

F

L

L

H

H

G

L

H

L

L

H

L

H

L

H

J

L

H

H

L

K

L

H

H

H

L

H

L

L

L

M

H

L

L

H

N

H

L

H

L

P

H

L

H

H

Q

H

H

L

L

R

H

H

L

H

S

H

H

H

L

T

H

H

H

H


* Prt code consists of the designation for set 1 followed by that for set 2, etc. For example, race MGB: set 1 (M) - virulent to Lr1,3; set 2 (G) - virulent to Lr16; set 3 (B) - avirulent (see Phytopathology 79:525-529).

** L = low infection type (avirulent pathogen); H = high infection type (virulent pathogen).


Cultivar/line - cultivar or line name, otherwise:

Comm - if collection is from a commercial field
Nur - if collection is from a nursery
Wd - if collection is from a weed
Comp - if collection is a composite from an area
Unknown - if unknown

Host Code - coded as detailed below:

Winter Wheat

Club Wheat



HRW

hard red winter wheat

SRWC

soft red winter club winter

SRW

soft red winter wheat

SWWC

soft white winter club wheat

HWW

hard white winter wheat

SWSC

soft white spring club wheat

SWW

soft white winter wheat

CW

unknown club wheat type

WW

unknown winter wheat type

Durum Wheat

Spring Wheat



SD

spring durum wheat

HRS

hard red spring wheat

WD

winter durum wheat

SRS

soft red spring wheat

D

unknown durumwheat type

HWS

hard white spring wheat

SWS

soft white winter wheat

Other Wheats

SW

unknown spring wheat type


W

unknown wheat type

TC

Triticum (Aegilops) cylindricum


Collector - initials of collecting individual

Collection Date - date collection made, in the format: month (2 digits) day (2 digits)

For example: January 6 = 0106, November 8 = 1108

Severity -

Code: 

TR 

LT

MD

HV

VB

NA

 Observation:

<1%

1-20%

20-80%

>80%

varies within field

 not available

Prevalence - same coding as used for severity

Source - source of collection:

Field = commercial field
Nursery = nursery
Non Cultivated = area not under cultivation
Unknown = source unknown

Coll - collection number (accession number assigned to collections as they arrive at the CDL)

Isol - isolate number (up to 3 isolates taken from each collection)


Last Modified: 6/27/2008