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countable and uncountable, plural ringspots
(phytopathology) A symptom of various viral infections in plants. quotations
Disease name: Tobacco rattle Causal virus: Tobacco rattle virus Symptoms: Necrotic local lesions, necrotic or chlorotic ringspots, systemic necrosis, ringspots, line patterns, mottling are the various symptoms induced in tobacco depending on the environment and cultivars.
2008, M. V. Nayudu, Plant Viruses