lay their eggs in that spot.
Observe nature
Diatomaceous earth to eradicate them
If you want to get rid of them permanently, you need to add diatomaceous earth to your soil. It’s a natural insecticide that dries out the parasite’s body and kills it.Worms to get rid of the larvae
You can also use nematodes, microscopic worms. They are predators of cockchafer larvae. They kill them by parasitizing their bodies . Nematodes are not harmful to your plants or other insects.
The chickens eat the larvae
Chickens are your vegetable