Virus positive plants, Agdia Immunostrip.

[DavidCampen]

My understanding is that infection occurs when sap from an infected plant enters an open wound on another plant. This could be from a cutting instrument or from sap on your hands or work surface or possibly from commingling of roots or possibly via sucking insects.

Of the 6 infected plants that I have found so far, 2 of them I selected for testing specifically because they looked unhealthy and lacking in vigor. None of the 6 plants had the classic chlorotic rings or mossaic patterns.

I don't understand your comment that
"I must admit to being apprehensive about testing, ... . Buying from vendors consequently becomes a huge issue."
If you don't want to confront the vendors then just trash the plants and if too many plants from a vendor arrive virused then stop buying from that vendor.