Descriptor: Stem Rust (STEMRUST)



 
Definition:
Infection types produced by Puccinia graminis f. sp. avenae
Crop:
OAT
Category:
Disease descriptors
Status:
Crop Germplasm Committee approved
Data Type:
Alpha/numeric descriptor
Maximum Length:
2
Comment:
[+, ++, -, =] indicate variation within an infection; c, b, n indicate chlorosis, browning,
Responsible Site:
National Small Grains Collection (NSGC)

Distribution of Values for Stem Rust (STEMRUST)

CodeDefinitionNumber of Accessions
;MOSTLY IMMUNE, NO UREDIA, BUT NUMEROUS HYPERSENSITIVE FLECKS PRESENT29
0IMMUNE; NO UREDIA OR OTHER INDICATIONS OF INFECTION32
1VERY RESISTANT; UREDIA MINUTE, SURROUNDED BY DISTINCT NECROTIC AREAS23
2MODERATELY RESISTANT; UREDIA SMALL TO MEDIUM, USUALLY GREEN ISLANDS SURROUNDED BY A DECIDEDLY CHLOROTIC/NECROTIC BORDER24
3MODERATELY SUSCEPTIBLE; UREDIA MEDIUM SIZE COALESCENCE INFREQUENT, NO NECROSIS, BUT CHLOROTIC AREAS MAYBE PRESENT128
SVERY SUSCEPTIBLE; UREDIA LARGE AND OFTEN COALESCING, NO NECROSIS BUT CHLOROSIS MAY BE PRESENT3886