Use clean, sodium-free fresh water to rinse accumulated salts from turf surfaces and to leach salts from the root zones of soils. Gypsum can be used to help leach salt from the soil. Gypsum works best when worked into the soil, but it can be broadcast on the surface. Water after the gypsum application to move it into the soil and root zone. Wait a few hours and water again.
Core aeration helps.
Japanese beetle white grubs overwinter as larvae in the soil below the frost line, then move up in the soil to feed on roots. They pupate in one to three weeks, casting off their skin so the adult beetle can emerge. Pupae resist pesticides. Japanese beetles fly in late June and July, moving as much as a half mile per day. Adults feed on 300 species of plants, preferring mostly grapes, raspberries and roses.