I'll echo Roberta's feelings.
"Stop testing to see fewer positives" sounds too much like a Chee-to president I know of, and is just sticking your head in the sand.
One thing to consider is that a negative Agdia result may not necessarily mean there is no virus present, but that it isn't currently at a level that triggers a positive. (I don't know that to be the case specifically, but I do know that's true with many biological indicators.)
I am of the opinion that plants - like humans - carry everything they have ever been exposed to. If they have proper care and are not unduly stressed, those may not reach chronic levels. Could that mean that a greater percentage of plants aren't as well cared-for as they were, or is this truly a case of more virus out there?
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