Everything I have ever read tells me that anything in the garlic/onion family is a deterrent to pests but I have a black aphid, leaves a purple stain when crushed, that is devouring my garlic chives. They are now moving to my onions and garlic. I have been spraying them with a soap solution and it kills them but they just keep appearing. I am getting frustrated and ready to pull up all my garlic chives and destroy them. I have an organic garden and don't want to use any chemicals. I would be glad to send some pictures of the little boogers and the damage they have done. Any help would be greatly appreciated. Sandra