article_snippet: They are thought to have come to our shores on imports of infected plants, but can also be spread by mealybugs and scale insects.
article_snippet: ‘our found four of these viruses in Wisley and one at Brogdale.
article_snippet: But our found these viruses in Wisley because our knew what our were looking for.
article_snippet: our visited two commercial sites in Suffolk and Surrey and found no signs of these viruses in Wisley at either.
article_snippet: Dr Clover added: ‘It is reasonable to suggest that they could have spread further, but it is impossible to say how far.