Yes they do this each year. You can stop it from happening by using Milky Spore. It kills the Japanese beetle grubs before they emerge into adults.
Japanese beetles
No. Witchetty grubs are the larvae of cossid moths. See the related link. Curl grubs turn into Christmas beetles and other scarab beetles. See the related links.
Japanese beetles spread mulch around plants to kill grubs in the soil. As the name suggests, these beetles are only found in Japan.
Certain beetles and other insects.Certain beetles and other insects.Certain beetles and other insects.Certain beetles and other insects.Certain beetles and other insects.Certain beetles and other insects.
Grubs
Grubs
Grubs! You know those ugly grayish-white grubs you dig up sometimes when digging in the spring? They are most likely the larval form of Japanese beetles - and guess what they feed on, before they hatch out of the ground to feast on your garden plants? They feed on the roots of your lawn! (There are a few other kinds of grubs that also eat grass roots - namely chafer beetle grubs and June beetle grubs - but at least their adult versions don't decimate our fruits and vegetables and flower gardens as well!)
Rabbits, grubs, moles, and Japanese beetles are a few garden and lawn pests.
a waxworm makes a cacoon and then turns into a moth
Many different birds eat Japanese beetles; however, they prefer to dine on the grubs.Predaceous insects such as the praying mantis occasionally feed on adult beetles and grubs, as do a few native wasps and flies.Several parasitic wasps, flies and plant-friendly beetles have been imported in an attempt to control the beetles, but have seen only limited success.
It is the pattern on the butt of grubs from which hairs grow. Grubs usually become beetles and the different types of beetles can be identified by the rastral pattern of butt hairs on the grub. Here are some good images: http://www.idlab.ento.vt.edu/IDLab/ornimages/rastralpatterns/rastral_pattern.htm
The grubs of the masked chafer beetle feed on the roots of grass.