What diagnostic symptom is typical of white grubs?

What diagnostic symptom is typical of white grubs?

• A. Large circular patches.
• B. Turf may pull apart easily due to root feeding.
• C. Yellowing with stippling.
• D. Dark lesions on leaves.

Answer: (B)

White grubs attack the turf by feeding on roots in the root zone. That root destruction weakens the sod, so the turf can be lifted or pulled apart easily with a light tug. You may also see the white, C-shaped grubs when you inspect the soil under the lifted turf, confirming root-feeding damage. The other symptoms point to issues affecting the leaves or above-ground canopy (disease, drought/stress, or foliar insects), not the root injury caused by grubs, so the easy-tug turf is the diagnostic sign that fits white grub activity.

White grubs attack the turf by feeding on roots in the root zone. That root destruction weakens the sod, so the turf can be lifted or pulled apart easily with a light tug. You may also see the white, C-shaped grubs when you inspect the soil under the lifted turf, confirming root-feeding damage. The other symptoms point to issues affecting the leaves or above-ground canopy (disease, drought/stress, or foliar insects), not the root injury caused by grubs, so the easy-tug turf is the diagnostic sign that fits white grub activity.