| Above ground |
Healthy plant |
1 |
| |
Slight yellowing of lower leaves |
2 |
| |
Yellowing of lower leaves upto the 3rd or 4th node, some stunting |
3 |
| |
Necrosis of at least half or more of the plants with some stunting |
4 |
| |
All plants dead or nearly so |
5 |
| Below ground |
Lesions |
(%) Root discoloration |
Root mass reduction |
|
| |
0 |
0 |
0 |
1 |
| |
0.1-0.2cm, small reddish brown at hypocotyl base |
0 |
0 |
2 |
| |
Coalescing of localized root/hypocotyl lesions from 0.5-1cm, around the stem |
10-20% |
0 |
3 |
| |
Lesions extending and completely encircling the stem |
95% |
5-10% |
4 |
| |
Increasingly discolored and extended hypocotyl lesions |
100% |
20-50% |
5 |
| |
Hypocotyl lesions encircling the stem extending up to 2 cm |
100% |
50-80% |
6 |
| |
Pithy or hollow hypocotyl with very extended lesions |
Dead |
Dead |
7 |
