How to deal with rose sawflies?

Hello, sawflies started damaging my roses about 3 years ago. I use garlic + soap spray on my roses but it does not help much. Each day I collect several sawflies from my roses and if I see damaged stems I immediately cut them off. I would appreciate it very much if you could advise me how to deal with sawflies (but I prefer not to use chemicals).

 

Garlic and chilli spray!

Insecticides are not very effective on sawfly, because they are related to bees and amateur insecticides are supposedly "bee-friendly" (not very friendly, but enough to stop them being effective on sawfly).

Boil three crushed garlic cloves and a tablespoon of chilli flakes in a half litre of water with a tiny drop of washing-up liquid. Cool, filter and use as a spray. It's both a deterrent and an irritant – the little grubs will drop off to get away from the chilli.

Don't breathe it in. Quite harmless, but it will make you cough.

 

Thank you. I will try to use your advice.