Chafer grubs are mainly found in lawns where they eat the roots of the grass. The adult beetles lay eggs in soil which develop in to grubs which then eat the roots of grass.
They can also affect vegetable beds where sudden die off of plants is the first sign of attack. If you see a healthy plant suddenly wilt and die dig out the soil around the plant to see if a grub is the cause.
There are several methods of control: ignore them, use a trap bated with pheramones or a biological control containing nematodes that is waterd on to the ground.
The following is from Pitchcare
- Primary Damage: Chafer grubs feed on grass roots reducing the plants ability to source water and food leading to greater susceptibility to biotic (organism) and abiotic (environmental) stress. The impeded rooting depth also reduces the surface stability of turf areas.
- Secondary Damage: Birds and mammals are attracted to the beetle larvae as a food source where they can cause extremely severe damage to turf surfaces as they peck and dig for the grubs.
Chafer Beetle traps help to reduce adult beetle egg laying and give a valuable warning that chafers are present. Monitoring the active life stage of insect pests forms an integral part of Integrated Pest Management and allows for better informed application timing of Entomopathogenic Nematode treatments.