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Table 1 Categorization of infested Parthenium hysterophorus individuals based on the severity of infestation by winter rust

From: Prevalence of Puccinia abrupta var. partheniicola and its impact on Parthenium hysterophorus in Kathmandu Valley, Nepal

SN Severity class Description of severity class
1 No Healthy plant with no infestation
2 Very low Only a few leaves infested without any apparent impact on growth
3 Low Premature senescence of some leaves but not apparent impact on inflorescence
4 Medium Death of about 50% of leaves with apparent impacts on inflorescence but not senescence of plant
5 High Death or senescence of plant