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This article examines the use of Chenopodium (C.) quinoa as an indicator plant for carnation latent virus. The reactions of C. quinoa to carnation latent virus are usually sufficiently distinct from those of other carnation viruses to provide a diagnostic indicator plant for routine testing of carnation. These reactions might sometimes be confused with those of vein mottle virus, but the latter is seldom seen in British carnation stocks. In sap-rubbing inoculation, C. quinoa reacted to carnation latent virus with indefinite local yellowish spots, followed by systemic interveinal yellowish spotting-mottle, puckering, and rugosity.