Russian Wheat Aphid
Reaction to the Russian Wheat Aphid (Diuraphis noxia). Leafrolling symptoms.
| Code | Term | Description |
|---|---|---|
| 1 | PLANTS APPEAR HEALTHY, MAY HAVE SMALL ISOLATED CHLOROTIC SPOTS | |
| 2 | 5% LEAF CHLOROTIC - CHLOROTIC SPOTS BECOME MORE NOTICEABLE | |
| 3 | 15% LEAF CHLOROTIC - CHLOROTIC SPOTS ARE LARGER AND MORE NUMEROUS. | |
| 4 | 25% LEAF CHLOROTIC - SOME STREAKING MAY BECOME APPARENT, ESPECIALLY ALONG TH EMIDRIB. | |
| 5 | 40% LEAF CHLOROTIC - CHLOROTIC SPOTS BEGIN TO COALESCE OR DEFINITE STREAKING OCCURS. | |
| 6 | 55% LEAF CHLOROTIC - LARGER CHLOROTIC SPOTS COALESCE. LEAVES START TO 'DIE-BACK' FROM TIPS. | |
| 7 | 70% LEAF CHLOROTIC - FURTHER SYMPTOMS DEVELOP. | |
| 8 | 85% LEAF CHLOROTIC - EXTENSIVE CHLOROSIS AND NECROSIS. | |
| 9 | PLANT DEATH OR NO RECOVERY POSSIBLE | |
| MIX | MIXED FOR RESISTANCE TO RUSSIAN WHEAT APHID |