If you have a flower garden, you will have lots of insects. Invasive insects can cause serious injury to your plants. Most attacks can be mitigated by good, healthy plants growing in good, healthy soil. Many bad bugs can be stomped or squished or swatted as needed, without any harm to beneficial bugs. That leaves a few bad characters that require a good battle strategy crafted by you and your local county extension agent. Remember, your extension agent loves to talk about insects, diseases, and the chemicals used to fight them. There are a lot of great bugs out there, too. If you want butterflies and honey bees, you need to be very careful with chemical toxins—herbicides and pesticides. Protect the friendlies. If you don’t like the idea of close contact with the inevitable bug populations that comes with flower gardening, then create wide, open paths in your garden beyond the high grass and flower beds to avoid direct contact with critters. Live and let live.
Japanese Beetles are one of the worst of the damaging insects. They are disgustingly prolific, covering entire blooms until they look black. They eat pretty flowers. They do nothing but consume and destroy beauty all day long. The best control for Japanese Beetles is to create a grid of small mounds of powdery Milky Spore disease over your entire property. Sometime in late July through September when the grubs are the most vulnerable, a dotted grid pattern can be applied to innoculate your entire property with the disease which targets only this specific pest. For better results, convince your neighbors to do the same. Traps and lures advertised in catalogs are useless. Milky spore bacteria kills only Japanese Beetles, and it is quite effective.