So....my Philadelphus is infested with blackfly! I tried spraying a nauseating mix of garlic and diluted washing up liquid on them but nothing happened. Yesterday I tried to coax 50 reluctant Ladybirds onto the bush but most ended up in my hair/up my sleeves/on my shoes. I can't use anything chemical based for wildlife/cat reasons but was wondering if anyone has any bright ideas? Should I leave the ladybirds to get on with it and maybe buy some more? Or should I bite the bullet and prune the branches?
Advice welcome!