STEWARTS WILT
Plant response to stewart's wilt organism (Erwinia stewartii (Smith) Dye )
| Code | Term | Description |
|---|---|---|
| 1 | Little or no spread. | |
| 2 | Limited spread with water-soaking - chlorosis - or necrosis withiint 3 cm. | |
| 3 | Limited spread predominately toward tip end of leaf only. | |
| 4 | Abundant spread bi-directionally in inoculated leaves only. | |
| 5 | Minimal systemic infection as small, linear streaks on non-inoculated leaves. | |
| 6 | Moderate systemic infection with 5-25% symptomatic leaf area on non-inoculated leaves. | |
| 7 | Abundant systemic infection and stunting with 25-50% symptomatic leaf area on non-inoculated leaves. | |
| 8 | Severe systemic infection and stunting with 50-90% of the plant infected. | |
| 9 | 90-100% infection - severe necrosis - or dead plants. |