you may also consider employing the benefits of compost tea for fighting fungal infections, and some insect prevention...
check out soilfoodweb.com for more info
also, naturescontrol.com sells beneficial insects, the majority of them target specific pests and leave the rest alone.
what is eating your cabbage? visible holes in the plants leaves? how large? do you see the pest or just the aftermath? different methods for different pests...
13013... overthrowing the world one small step at a time.