I have been sent a poster by Frank Visser produced by Catherine Hardiman entitled: Ant toxin: A strategy for the indirect control of mealybug, vector of Grapevine leafroll-associated virus type 3 (GLRaV-3). 

This is attached

There is a thesis too of Catherine's study, with the same name, but I have failed to reduce it to a reasonable size. However, if you would like to see it, let me know (grahamejackson@gmail.com) and I will forward the request to Frank.