Stem Rust Seedling
Seedling infection types produced by Puccinia graminis f.sp. tritici.
| Code | Term | Description |
|---|---|---|
| 0 | IMMUNE - NO UREDIA OR OTHER INDICATIONS OF INFECTION | |
| 0+ | NEARLY IMMUNE - NO UREDIA BUT A FEW HYPERSENSITIVE FLECKS PRESENT | |
| 1 | VERY RESISTANT - UREDIA MINUTE - SURROUNDED BY DISTINCT NECROTIC AREAS | |
| 2 | MODERATELY RESISTANT - UREDIA SMALL TO MEDIUM - USUALLY GREEN ISLANDS SURROUNDED BY A DECIDEDLY CHLOROTIC/NECROTIC BORDER | |
| 3 | MODERATELY SUSCEPTIBLE - UREDIA MEDIUM SIZE COALESCENCE INFREQUENT - NO NECROSIS - BUT CHLOROTIC AREAS MAYBE PRESENT | |
| + | MOSTLY IMMUNE, NO UREDIA - BUT NUMEROUS HYPERSENSITIVE FLECKS PRESENT | |
| S | VERY SUSCEPTIBLE - UREDIA LARGE AND OFTEN COALESCING - NO NECROSIS BUT CHLOROSIS MAY BE PRESENT | |
| X | HETEROGENEOUS - UREDIA VARIABLE - SOMETIMES INCLUDING ALL INFECTION TYPES AND INTERGRADATIONS ON THE SAME LEAF |