There are six species of Chafer beetles in the U.K. Several of these species can cause significant damage to lawns and turf in their larval stage. The most common species is the Garden Chafer [Phyllopertha horticola] , which emerges as adults from lawns in May-June. It quickly mates and starts to lay eggs that develop into larvae or grubs from about late July - early August. If left un-treated these grubs will continue to feed in grass roots into the autumn. Once the soil temperatures drop, then feeding slows and stops. They will then overwinter deeper in the soil structure and rise to the surface to feed again in the spring before pupating in April-May before emerging as adult beetles.
The grubs feed on grass roots turning areas of lawns yellow and attracting birds and animals to feed on them. Badgers especially like to feed on Chafer grubs and will rip up large areas of turf to find and eat them. This damage is often more severe than that caused by the Chafer grubs.
For Lawns that have suffered damage, try our LAWN GRUB REPAIR BOOST, this natural Biostimulant boosts root and lawn growth. It helps stimulate microbial activity in the lawn leading to healthier lawns and can be used in combination with nematode treatments.
How to control
The first step is to monitor for Garden Chafer Beetle activity by placing Garden Chafer traps out in May. These will attract and catch adult beetles, reducing egg laying and providing a warning of forthcoming chafer grub populations. Once Chafer grubs are detected in lawns from the end of July, apply CHAFER GRUB KILLER nematodes. Depending on the severity of the infestation 1-2 applications maybe required. A spring application of nematodes in April can be applied but is far less effective than the late summer treatments.