the biggest pests in my garden are my
chickens! no really, I have used a pesticide twice in my garden in 7 years that was three years ago. that was for squash bugs that were systematically moving through and destroying my canteloupe and for some kind as of yet unidentifiable beetle plague that was defoliating my tomato patch. the
chickens are actually helpfull in many ways because they get the bugs.
strange about the japanese beetles for you . I have tons of them here. They swarm late in the year over the fescue but they never touch my garden. I have found that if I use my trusty dust buster diligently to suck up squash and potato beetles early in the year I can back off a little and it isn't a problem later.
some things I have noticed.
Gardens in urban areas have many more pest problems. I think it is due too a disturbance of natural predator prey populations as well as more enviromental contamination of the soil and air and the higher likelihood of gardeners to use chemical fertilizers.
Although many people appreciate the aesthetic qualities of neat little rows of plants they really do much better if they are randomly planted in the garden. Pests and diseases have a more difficult time moving through the garden to desimate it. This makes it a bit less efficent as far as grouping similiar plants with similiar needs but with a little thought your "random" planting can have some logical pattern that incorporates both schools of thought.
Any time you choose to plant
alot of anything you are offsetting the balance of the garden and inviting a particular pest(s) to flourish by providing and over ubandance of their favorite food and likely an increase in their populations the following year. variety is your gardens friend.
Pests have a cycle covering years just like other animals such as deer. populations surge in years of abundance, begin to fail when population outnumber resources (this is when they become destructive) and level off again for a while. This is another reason why it is important to have a variety of plants in your garden.
people who really depend on the garden for sustenance (as in can't go out and replace desimated crops with store bought items) are a little more lenient in the pesticide department. thoughtful sustenance gardeners search for the
root of the problem to fix it but in the mean time do what they have to do to
feed their family and I withold judgment in those situations. do the best you can imo.