borncamp pretty much covered it, but let's try it from a philosophical model, as that is where the difference really lies. To get the emotional aspect of bees out of the concept, let's do farmers and soybeans. We have three types of farmers for the sake of this discussion, conventional, IPM and organic.
The crop of soybeans is growing and it's the time of year the aphids are multiplying.
The conventional farmer sprays for aphids because that's what the Extension agent said was the right thing to do.
The IPM farmer calculates the rate of infestation, the likely cost in lost production if he does not spray for aphids. Then he calculates the cost of spraying for aphids. If the loss in production is less than the cost of spraying he doesn't spray. If it's more he does spray.
The Organic farmer became an organic farmer because he considers the impact to the ecology of insects, that will occur if he sprays. It will kill off all of the predators of the aphids along with the aphids and kill many other beneficial insects as well. Plus the runoff into the creeks and rivers, plus the contamination of the ground water. He considers the ecology to be a kind of super organism that needs a balance. Therefore he doesn't spray.
http://www.bushfarms.com/beesphilosophy.htm