If the plants are infested by unnecessary pests, what could be the problem? One root of the problem could be the plants themselves. They may be depressed or stressed. What have you done to them? This type of gardening means that you are to take things personally. You are being one with nature. So this succeed on this, you've got to take things seriously.
What makes a plant depressed? You may not be spending enough time with it. It may sound weird, but talking to your plants or singing to them may help you with the whole process. Throughout your gardening trek, you should be able to familiarize yourself with all the plants in your garden. You have to know how to make your plants healthy, happy and productive.
If you have to pick out the pests manually, then do it. This can be done as long as there are only few that can be found on your garden. You must only resort to the pesticides once the situation becomes uncontrollable.
You can also add some insects and animals that will help you kill the pests. This way, you are still staying in touched with nature and helping in the process of food chain. For example, a lady bug would eat up an aphid banquet. Frogs and lizards can also help you sort your problems with these pests.
Above everything else, whatever problem you may encounter in organic gardening, just think about nature. How are you going to solve things that you will still be able to help nature and be one with it.