We are working on documenting the fungal and bacterial diseases in a brinjal cultivar. So there we could observe in the field severe leaf spot symptom. We are calculating disease incidence percentage considering more than 50% of plant is infected. Is it wrong if disease incidence is calculated for leaf spot and fruit rot ?
Arya Kaniyassery I believe, nothing's wrong if disease incidence is calculated for leaf spot and fruit rot. Because, disease incidence is an important variable for this kind of study.
In my view there is nothing wrong in calculating disese incidence percentage for leaf spot disease, even it give better understanding and insight about the severity of disease which will be good for the better management of this disease and prophylactic measures can be taken in advance and we can prevent the crop from occurance of this disease.
In plant pathology there are 3 measurements commonly used. Incidence is the number of plants infected. The second measurement is severity with refers to the intensity or coverage of the symptoms and 3) is measurement of the epidemic referred to area under the disease curve.
It is important to do repetitive measurements at different stages to measure the epidemiology and get the most knowledge. The accurate measurement depends on a well constructed visual scale to assess severity visually.
Severity readings usually are most important and at critical stages for the development. Reading about disease assessment scales and the use of epidemiological calculation were originally described by Van der Plank. Good luck on your endeavor.
Thanks a lot Paul Reed Hepperly Ashwini Tiwari , Mahamud Hasan Prince for making some time to clear my doubt.
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