Measurement of Faba Bean Diseases
3.4. Scale for Rating Rust in Faba Bean in the Field (Figs 24 and 25)
|
DISEASE
RATING
|
HOST
STATUS
|
DESCRIPTION
|
|
|
1
|
Highly
resistant
|
No pustules or very resistant small non-sporulating flecks. | |
|
3
|
Resistant
|
Few scattered pustules covering less than 1 % of leaf area, few or no pustules on stem. | |
|
5
|
Moderately
resistant
|
Pustules common on leaves, covering 1-4% of leaf area, some pustules on stem. | |
|
7
|
Susceptible
|
Pustules
very common on leaves, covering 4-8% of leaf area, many pustules on
stem. |
|
|
9
|
Highly
susceptible
|
Extensive pustules on leaves, petioles, and stem covering 8-10% of leaf area, many leaves dead and plant defoliated. | |
| Fig. 24. Standard area diagram of faba bean leaves with increasing rust severity. |
| Fig. 25. Scale for rating rust in faba bean in the field. |
