During a recent greenhouse visit, a few scattered cyclamen plants were observed to be showing bullseye ringspots on the leaves. Further inspection revealed that the symptomology was present on a few leaves on the plant, which is a distinct characteristic of an INSV infection. In some cases, the leaves also had slight chlorosis developing.
Symptoms can be masked by the plants' waxy surface; ringspots are less noticeable in some areas of the leaf and more prominent in others. In addition, leaves will eventually begin to develop chlorosis and subsequently necrosis. If the problem is not noticed initially, this is the stage where it will be easily observed.
These are all typical signs of a virus infection in cyclamen. A plant was tested for INSV, and Impatiens necrotic spot virus was confirmed with an enzyme-linked immunosorbent assay (ELISA) test conducted by Mike Munster of the NC State University Plant and Insect Clinic.
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