Definition - What does Virus-Tested mean?
All vineyards that engage in winemaking must undergo laboratory testing or field diagnosis for viruses. This process ensures the vineyard is virus-tested. Products from virus-tested vineyards are higher in quality and yield. There are two ways to detect viruses in plant species: field diagnosis and laboratory testing. With technology getting better every day, field diagnosis is slowly getting replaced by laboratory testing.
WineFrog explains Virus-Tested
Field diagnosis is done by observing symptoms of diseases in plants on the basis of what changes are seen, mostly visually. For example, observing changes in the color of leaves to red suggests a disease called leafroll. This method was used widely in the past, but with numerous diseases, clashing symptoms and the inconclusive nature of findings makes laboratory testing a better method of virus testing.
Laboratory testing includes several methods for testing viruses, such as serological tests and molecular tests. There are many other methods used in laboratories to identify viruses and diseases, but these are considered the best and most widely used methods for virus testing.