Handpick by shaking infested leaves over a can with a little kerosene in it. Milky Spore Disease is lethal to grubs but harmless to plants and animals. Don't apply with insecticide, as the insecticide will kill off the host. Bated traps will usually solve even the worst Japanese Beetle problem. Varied in color.
Leaves turn yellow.
Plant alliums such as garlic and chives. Anise, coriander, nasturtiums, and petunias may be helpful. Use sticky yellow traps or yellow dishes containing soapy water. Soap sprays and mint tea spray is highly effective. Lacewings will eat 100 aphids per day.