Description
A virus with fiexuous filamentous particles c. 750 nm long, prevalent in bulbous and rhizomatous irises and occasionally present in crocus. It is transmissible in the non-persistent manner by aphids and, less easily, by mechanical inoculation. World-wide distribution. Causes conspicuous chlorotic stripes and/or mosaic patterns in the leaves, and breaking in the flowers of intolerant cultivars of bulbous iris, rhizomatous iris and Crocus vernus. Symptoms are usually more severe in plants grown at temperatures of 16°C or less, or in those also containing other viruses