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Grub control in lawns PDF Print E-mail
Written by Wauneta Breeze   
Thursday, 23 June 2011 14:52

Multiple challenges can face gardeners and landowners during the growing season. Right now is a good time to apply systemic grub control in lawns to reduce grub infestations and damage.

Grub control in lawns is a yearly challenge to address to maintain turfgrass health. Control measures are used to reduce the population and the damage that white grubs, masked chafers, Japanese beetles, and May/June beetle larvae create in turfgrass lawns.

As the larvae grow and develop in the soil, they move closer to the root zone of many types of turfgrass, feeding as they develop. At their final and most damaging stage, they will actively consume grass roots before they pupate into beetles.

Grub damaged lawns will exhibit dead spots. Damaged grass will be discolored in these spots, and can be easily pulled without any accompanying roots. Root loss will cause the damaged grass to quickly die.

According to “White Grub Management” from the University of Nebraska-Lincoln Extension, now is a good time to apply systemic insecticides containing chlorantraniliprole, clothianidin, halofenozide, imidacloprid, or thiamethoxam on the active ingredient label to the entire lawn. Apply ½ of water immediately after application to help the product absorb into the roots system of the grass. Once larvae start feeding on treated roots, they will receive a dose of the toxin.

If these products did not produce the desired level of control, or turfgrass damage was not detected, a “rescue” treatment can be directly applied to infected areas. These products, which contain carbaryl or trichlorfon on the active ingredient label, can be applied. These products do not last as long in the lawn, but are fast acting when they come in contact with the damaging larvae.

Dry conditions can also impact larvae contact with these control products. In these cases, apply ½ inch of water 48 hours before application to help encourage the larvae to move closer to the surface for more effective control.

If you have any questions about grub control in lawns, please contact me at This e-mail address is being protected from spambots. You need JavaScript enabled to view it , by calling (308) 532-2683, or by contact your local University of Nebraska-Lincoln Extension Office. Have a great week!