Every orchard tends to draw its own bugs depending on region and climate. Just like molds and fungus you need to be mindful of not planting too close to your garden. If you are growing dwarf sized trees you might be able to get by with handpicking the occasional bug you can see munching on a leaf.
I have to admit that handpicking rarely lasts long enough and usually you will have to turn to other more aggressive methods. Sticky traps are a great tool for catching apple maggots and fruit flies. You should hang one trap per dwarf tree, two for a semi-dwarf. A fully mature standard tree might need as many as 4 or 5 traps to keep the most pests in check.
Another more organic option for you to try is to hatch your own predatory insects to hunt down and kill your insect enemies. The master assassin in the class is the classic Praying Mantis. You need to be mindful that if you hatch an egg case of praying mantids in your orchard, they will kill all insects. Mantids operate without prejudice killing pests as well as beneficial insects. Colorado potato beetles and honey bees taste the same to a praying mantis. The praying mantis is happy to rip the head off and feast on any bugs that land nearby.
There are some years where it seems like your fruit trees can go through most of the season without attracting a single bug. Suddenly as the fruit begins to ripen the tree explodes with ants and fruit flies. For these minor insect flare ups you can fall back on organic insecticidal soap. They are often sold in medium sized spray bottles. As long as you are not plagued by frequent rain you should be able to spray the fruit once a week. These bottles usually come with a small packet of information from the manufacturer which will help you with additional tips and frequently asked questions.