gooseberry sawflies

Has anyone got an organic solution to these horrors except for manually picking them off?
 

If you hoe the ground under the gooseberries it helps because the sawflies pupate in the ground under the plants.

I planted garlic round mine three years ago and never harvested them. They are still there growing grass like foliage and I haven't had sawfly since they were originally planted.

Would chives work as well?

Would chives work as well?

Worth trying, but maybe garlic chives would be a better bet. The garlic I used were just the odd small cloves that were left over after planting up my beds. They probably didn't grow very large but obviously split as the next year there were a group of shoots from each planting spot, I divided the larger clumps and so it has gone on. I think they may need replenishing this year so will plant a few cloves from this years harvest.