Small concentrations of grubs can be found in nearly every lawn, but once their numbers increase, lawn grub damage may become evident and their presence attracts larger creatures who consider these larvae to be a tasty treat. Learn how to get rid of lawn grubs and stop them from returning with expert advice from The Grounds Guys®.
What Are Grubs?
The word "grub" is used to describe the larvae of various species of beetles. During the cold winter months, their eggs lie dormant in the soil and hatch in the spring once the ground heats up. Lawn grubs feast on plant roots and once they become adults, they lay more eggs which perpetuates the cycle.
Lawn grubs are small and off-white in colour with a darker head. Once exposed they tend to curl up into a "C" shape and typically vary between one-half and one inch in length.
Signs You Have Lawn Grubs
Grub damage is often mistaken for other lawn issues, but if you know what to look for, you can save time and regain control over your lawn. Signs include:
Increased Activity
Lawn grubs are a favourite source of nourishment among birds, moles, raccoons, skunks, and other creatures. If you notice an increase in activity during the early morning or evening hours or see signs of digging, you may have grubs.
Spongy Texture
Since grubs feast on roots, there may be nothing left to anchor the grass to the soil. Spongy patches may be able to be rolled back like a carpet, exposing the grubs beneath.
Discolouration
Once the roots are damaged the grass will begin to turn yellow and die, resulting in irregularly shaped brown patches throughout your lawn.
High Concentrations
To definitively test for grubs, wait until after a heavy rain and dig up one square foot of your lawn where the grass has turned brown to expose the soil beneath. If there are more than five grubs within the patch, your lawn will benefit from a treatment plan.
How to Get Rid of Lawn Grubs
Nematodes
Nematodes are one type of natural treatment option for those who wish to avoid using chemicals. These microscopic worms are released into the soil and make their way into the bodies of the grubs. Once there, they release infectious bacteria which multiplies and eventually proves fatal to the host. Nematodes are applied to the lawn in liquid form and may take several years to become established.
Pesticides
If you find five or more grubs per square foot, apply appropriate treatment according to label directions. Then, water the treatment thoroughly (1/2 to 1 inch of irrigation) to move pesticides down to root zone where grub feeds. Properly dispose of any pesticide containers according to label directions. Never pour leftover pesticide down drains for storm sewers.
When and to apply pesticides depends on where you live. For the most accurate recommendation on all things pesticides, seek advice from the professionals and contact your local The Grounds Guys office.
For expert advice on grub control for lawns and professional commercial and residential landscaping services, call The Grounds Guys at (888) 972-8063 or contact us online and let us know how we can help.