Descriptor: Russian Wheat Aphid Chlorosis2 (RUSSAPHID_2)



 
Definition:
Reaction to the Russian Wheat Aphid Biotype 2 (Diuraphis noxia). Amount of chlorosis. See RWA Leafroll descriptor, also.
Crop:
WHEAT
Category:
Insect descriptors
Status:
Crop Germplasm Committee approved
Data Type:
Alpha/numeric descriptor
Maximum Length:
3
Responsible Site:
National Small Grains Collection (NSGC)

Distribution of Values for Russian Wheat Aphid Chlorosis2 (RUSSAPHID_2)

CodeDefinitionNumber of Accessions
1PLANTS APPEAR HEALTHY, MAY HAVE SMALL ISOLATED CHLOROTIC SPOTS90
25% LEAF CHLOROTIC, CHLOROTIC SPOTS BECOME MORE NOTICEABLE387
315% LEAF CHLOROTIC, CHLOROTIC SPOTS ARE LARGER AND MORE NUMEROUS.568
425% LEAF CHLOROTIC - SOME STREAKING MAY BECOME APPARENT, ESPECIALLY ALONG TH EMIDRIB.691
540% LEAF CHLOROTIC, CHLOROTIC SPOTS BEGIN TO COALESCE OR DEFINITE STREAKING OCCURS.914
655% LEAF CHLOROTIC, LARGER CHLOROTIC SPOTS COALESCE. LEAVES START TO "DIE-BACK" FROM TIPS.1041
770% LEAF CHLOROTIC, FURTHER SYMPTOMS DEVELOP.1048
885% LEAF CHLOROTIC, EXTENSIVE CHLOROSIS AND NECROSIS.1063
9PLANT DEATH OR NO RECOVERY POSSIBLE8433