Organic farmers do not usually have problems with insects and plant diseases in field crops. Problems with insects and disease can usually be traced to problems with either the health of the soil or the crop rotation.
If you're an organic farmer and you keep bees, or have a friend who keeps bees, then breeding disease resistant potatoes is easy. Just get seed tubers of about twenty good potato varieties, and plant a row of each variety. If necessary, protect against Colorado beetle with Bt or natural pyrethrum, and protect against blight with copper.
Sheep fit well into many farm operations. If self-sufficiency and sustainability are your goals, raising sheep has many advantages.
Well kept turf grass can create a pleasant setting for your home, an oasis for golf and leisure activities, and a play area for children.
“A cloak of loose, soft material, held to the Earth's hard surface by gravity, is all that lies between life and lifelessness.”