How do we stop vine weevils?

QONE of our trees is infested with vine weevils and they are attracting wasps. We have removed as many as we can and used a spray but usually another batch appears the following day. The wasps appear very enticed by them. What could be causing them to attach to this particular tree, which is a sally, and how do we keep them away? We have issues with some of our pots having vine weevil larvae in them.

AIT sounds more likely an infestation of dark greenfly, which is common on willow. The wasps collect sweet honeydew from the greenfly for food. Winter cold is likely to finish them off. If you use half unsterilised garden soil and half compost, you will have very few vine weevil larvae — or apply Nemasys, the nematode parasite.