Diazon on your food or was it Diazinon?
Ok, try insecticidal soap. Use it exactly as directed on the bottle and spray the infected plants and the ones next to them. You will probably have to repeat this 3 or 4 times if you have a heavy infestation, but only do it as often as the manufacturer recommends.
If you still feel you need something stronger, try something like this with pyrethrin in it.
You might also want to improve air circulation around your plants if at all possible.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.