Grub Control and Lawn Repair in Central Ohio: October Action Plan

Significant grub damage visible in early October in central Ohio. When/how to treat grubs, when/how to repair lawn.

Critical Timing: Don't Treat in Spring

• Spring grubs are large, resistant, near pupation. Insecticides ineffective.
• Summer brings new beetles → new eggs → new grubs.

Correct Treatment Window: Late Summer/Early Fall

Right now (early Oct) is still okay for curative treatment if grubs are actively feeding near surface. But ideal was Aug–Sept.

Step 1: Confirm Grubs & Threshold

• Cut 1 ft² flap, peel back. Count grubs.
• > 5–10/ft² = treatment warranted (aesthetic areas).
• ID species if possible (Japanese beetle, masked chafer, etc.).

Step 2: Choose Product (Curative Now)

Step 3: Repair Damaged Lawn

• Sod: Anytime ground not frozen. Best instant fix.
• Seed: Too late for reliable establishment (Oct in Ohio). Wait until spring (Apr) or dormant seed (Nov–Dec).
• Prep: Remove dead turf, loosen soil, add starter fert, lay sod/seed, water daily.

Step 4: Prevent Next Year

• Apply preventive (imidacloprid, chlorantraniliprole) in June–July before egg hatch.
• Scout Aug–Sept; treat curatively only if thresholds exceeded.

Treat now if grubs active. Sod for instant repair. Prevent next June. That's the cycle.