Viral diseases are infectious disorders caused by small intracellular parasites, which need host cells to survive. Viruses are usually transmitted by insects and mites to plants. Some viruses are serious plant pathogens such as rose rosette virus or tobacco rattle virus.
Typical leaf symptoms of viral diseases include mosaic patterns, chlorotic or necrotic lesions (Figure 13), yellowing, stripes or streaks, vein clearing, vein banding, and leaf rolling and curling.
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