Measurement of Faba Bean Diseases
3.1. Scale for Rating Chocolate Spot
|
DISEASE
RATING
|
HOST
STATUS
|
DESCRIPTION
|
|
|
1
|
Highly
resistant
|
No lesions or few small brown, non-sporulating specks, covering up to l % of leaf surface. | |
|
3
|
Resistant
|
Few small, discrete, brown,circular,nonsporulating lesions (2-3 n1m in diameter) covering between 1.1 and 2 % of leaf surface. | |
|
5
|
Moderately
resistant
|
Lesions common (3-5 mm in diameter) some coalesced, covering 2.1-5% of leaf surface, with some defoliation and very poor sporulatinn. | |
|
7
|
Susceptible
|
Large
coalesced irregular lesions which are blackish, sporulating, and cover 5.1-10% of leaf surface, average defoliation, flower drop, and some dead plants. |
|
|
9
|
Highly
susceptible
|
Extensive large coalesced irregular lesions which are blackish, heavily sporulating, and cover more than 10% of the leaf surface, severe defoliation, stem girdling, and death of great majority of plants. | |
