Controlling White Grubs in the Lawn
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June 8, 2023
Taylor Campbell
This is Taylor Campbell, horticulture extension agent with North Carolina Cooperative Extension Burke Center. Today’s program is on controlling white grubs in the home lawn.
White grubs, the larval stage of scarab beetles, can cause significant damage to turfgrass in North Carolina. The Japanese beetle is the most damaging beetle species to both turfgrass and ornamentals. Two additional scarab beetles, the black turfgrass beetle and the oriental beetle, are also becoming a problem. These beetles go through a complete metamorphosis, transitioning from egg to grub to pupa to adult.
To inspect for grubs, examine the root zone and the upper 1-3 inches of soil. Grubs feed on grass roots and can cause wilting and yellowing of the grass.
Different types of white grubs have specific treatment thresholds. Treatment thresholds range from 4-10 grubs per square foot, depending on the beetle species and the health of the turfgrass.
Proper cultural practices, such as soil preparation, turfgrass selection, and maintenance, can help prevent grub infestations. Biological controls, such as beneficial nematodes, and chemical controls, such as contact insecticides, can be used to manage grub populations if necessary. Overall, maintaining a healthy turf is key to managing white grubs effectively.
This has been Taylor Campbell, horticulture extension agent with North Carolina Cooperative Extension Burke Center. For more information on garden pest management, call us at 764-9480 or visit our website at burke.ces.ncsu.edu.