What sign best differentiates grub damage from drought stress in turf?

What sign best differentiates grub damage from drought stress in turf?

• A. Drought-related wilting without signs of root feeding or soil-dwelling larvae
• B. Root feeding signs and C-shaped larvae present in the soil
• C. Uniform leaf yellowing with no roots involved
• D. Leaf scorch caused by high salt in soil

Answer: (B)

Grub damage is identified by signs of feeding (root damage) right in the root zone, plus the actual larvae living in the soil. Seeing root feeding signs paired with C-shaped grub larvae is a direct, tangible indicator that pests are causing the turf problems, not a lack of water. Drought stress can cause wilting and yellowing, but it won’t come with damaged roots and visible grubs in the soil. So, the combination of root-feeding signs and the presence of C-shaped larvae is the clearest clue that grub injury is at play.

Grub damage is identified by signs of feeding (root damage) right in the root zone, plus the actual larvae living in the soil. Seeing root feeding signs paired with C-shaped grub larvae is a direct, tangible indicator that pests are causing the turf problems, not a lack of water. Drought stress can cause wilting and yellowing, but it won’t come with damaged roots and visible grubs in the soil. So, the combination of root-feeding signs and the presence of C-shaped larvae is the clearest clue that grub injury is at play.