Yam Ontology 
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Concept details
| Key | Value |
|---|---|
| method_id | CO_343:0010088 |
| method_name | Viruses infection severity - Estimation |
| ontology_id | CO_343 |
| ontology_name | Yam |
| method_class | Estimation |
| method_description | Observe relative or absolute area of plant tissue affected by virus disease and record the severity as a proportion or percentage of plant surface affected using visual five ordinal scale . Predominant severity per plot must be registered at least thrice : 8 to 10 weeks after planting, 4 to 6 weeks after first scoring and the last scoring at 4 to 6 weeks after the second scoring |
| formula | Estimate mean virus severity by summing severity scores >1 in a plot divided by total number of symptomatic plant |
| method_reference | IITA, working documents |
| language | EN |
| created_at | 2022-11-07-09:06:33 |