Bacillus Thuringiensis will do the trick. Apply when you first see the white cabbage moth flying around your plants.

The green balls you speak of is the excrement from the cabbage moth larva, the cabbage looper. Those little devils will devour the plants of the cabbage family quickly.

Read the post currently right above yours called How to kill harmful insects while, keeping bees.

so I guess its down to liquid soap for the aphids which I already used but found to be useless unless your at it everyday.For the cabbage its products called Dipel or Thuricide,do they have common names because i tried looking in the local stores and have com e up empty.

I have had great success just using tulle as a "row-cover" (generally just a plant or two... not much of a row) to prevent the looper caterpillars and aphids.

If it's too late for that, though, bT (those products you listed) definitely does the trick.

Slugs are my main problem when it comes to these crops usually, though. :P Copper netting or sluggo to the rescue.