Epiphyllum Mosaic Disease
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This is quite common amongst cacti. Symtoms are pale yellow sunken spots which are not clearly defined, usually starting at the edge of the plant and spreading towards the centre.
Epiphytes such as Schlumbergera and Rhipsalidopsis are often attacked.
Viruses can be spread by insects such as aphids in the greenhouse, or by taking cuttings with an unsterilised knife.
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