I have an ornamental weeping willow in my garden and it is covered in rust and also these grey bugs. There are also these green spherical growths on some of the leaves - maybe egg sacks? I have seriously hacked back the tree so it has gone from looking like 'cousin it' to an umbrella, and I've removed the worst infected leaves but I think I need to treat it somehow.
Any ideas
![Confused :?](./images/smilies/icon_confused.gif)
Thanks
Lucy