White grubs can turn a healthy green lawn into a patchy, uneven landscape before many homeowners realize there is a problem. These small lawn pests feed below the surface, damaging grass roots and creating brown, irregular-shaped patches that stand out against the rest of the lawn. In some cases, the damage does not stop there. Raccoons and skunks may dig up sections of turf in spring or fall while feeding on the grubs, leaving behind even more visible damage.
Summer Timeline for White Grubs
White grubs eventually turn into flying beetles, which typically emerge in June. Once active, these beetles lay eggs in lawns, starting the cycle again. This is an important time of year because the conditions in your lawn can influence how severe the grub population becomes.
Moisture plays a key role during this stage. When grubs and adult beetles are active in June, watering can help reduce egg laying. A healthy, properly watered lawn is also better equipped to withstand stress and recover from minor damage. While June is not when most homeowners notice the worst symptoms, it is an important month for preventing a larger problem later in the season.
Signs of White Grub Damage
The most common signs of white grubs are:
- brown, irregular-shaped patches in areas that were once green and healthy
- loose or weak grass where the root system has been damaged
- dug up patches of the lawn from raccoons or skunks
Secondary damage can be more frustrating as the grub damage itself. Once animals discover a food source, they may return and continue tearing up sections of turf.
The Solution: Nematode Applications
Since Ontario’s pesticide ban has been in place, white grubs can no longer be treated the traditional way. A more natural option is the use of nematodes, which are microscopic parasites and a natural enemy of the white grub.
Nematodes are applied as a spray from late August into September, for the most effective timing. Nematodes are applied later in the summer because white grubs are closer to the soil surface and actively feeding at this time. The spray offers approximately 50% efficacy, but success depends heavily on moisture.
After application, the lawn must be watered for three days to keep the nematodes alive. If the lawn is allowed to dry out, the application will have no effect on the grubs.
Book Your White Grub Lawn Treatment with Wright Landscape Services
White grubs can quickly weaken your lawn and attract unwanted digging from animals. Wright Landscape Services can assess your lawn and apply the right seasonal treatment to help reduce the grub population. Book now to protect your lawn and keep your property pristine.
