Im using lacewings to control aphids.
This one about pumpkin diseases from a similar resource in USA that they call Extension Office.
I must admit I too thought to prune in winter to prevent sunburn but apparently that was not a good move. The industry experts recommend pruning right after the crop has been harvested as the trees go into a state of dormancy for a few months whilst still having reserves in their branches.
Thanks for that, I don't mind wait and see but it's in a location where if it turns into a tree it might be an issue. After a heap of googling it looks like it's a 'Royal Empress Tree', a species of Pawlonia, not what I want growing where it is.