The
billbug grub is a destructive lawn-damaging insect. The two types of billbugs
in our region are the bluegrass billbug and the Denver billbug. Both types
of adult billbug beetles spend the winter in or near the lawns they infested
the previous year.
In the spring, these small gray-black beetles can be identified by a distinguishable bill or snout which is used for burrowing and is also capable of chewing leaf blades. Both types of adult billbug generally cause little damage to the turf, but they lay eggs in the grass plant which later hatch into the lawn-damaging larvae or grub. The destructive grub chews on grass stems and feeds on the roots.
The bluegrass billbug grub causes damage during the midsummer months; however, because it hatches later, Denver billbug grub damage occurs during the fall.
Springtime activity of adult billbug beetles is a good indicator that grub damage is likely to occur later in the season. Damaged turf may be eaily pulled loose at the base of the plant. Later, the affected areas will appear dead or dormant.
To inspect for grub presence, cut away the sod in the green margin in the damaged area.Check the underside area of the cut section and also the soil surface for a brown-headed, fat, white, legless grub.
Control Practices:
Pro Care's lawn program provides applications for both prevention of billbug damage as well as for controlling present damaging insects. Also, proper fertilization which is provided in our lawn program will keep grass plants vigorous to minimize damage and support lawn recovery.
Provide adequate moisture to damaged areas. Since roots are damaged, supplemental watering is required to sustain the injured turf and to promote regrowth. Keeping the lawn moist in the spring and fall helps provide the proper environment for a naturally occuring fungus which destroys the adult billbug. A proper mowing height of 2-3" through the season will help keep a lawn healthy to minimize billbug damage. Overseeding damaged areas with quality seed is also recommended.
The Pro-Care staff is always ready to assist you with your lawn. Please call us if we may provide any information to enhance your lawn's health or appearance.