White Pine Thinning & Tip Browning: Tip Moth, Weevil, or Roots?

Diagnosing Decline in a 6-Year White Pine Planting

One of 14 white pines (15–20 ft) in northern Ohio thinning with tip browning needs an on-site ISA arborist. Remote diagnosis is unreliable, but top suspects:

Likely Causes

• White pine tip moth (Rhyacionia frustrana): Larvae bore into terminal buds → dead, hooked leaders ("shepherd's crook").
• White pine weevil (Pissodes strobi): Kills top leader → bushy, multi-topped tree.
• Root issues: Phytophthora root rot (wet clay), girdling roots, planting too deep.
• Environmental: Winter desiccation, salt spray, drought.

Why Professional Help Is Critical

• Time-sensitive: treatment windows for borers are narrow (early spring).
• Root excavation needed to assess below-ground health.
• Adjacent trees at risk if infectious.

Immediate Owner Actions

• Hire ISA-certified arborist this week.
• Photos of whole tree, base, tips, and bark.
• Do not fertilize or prune live wood until diagnosed.

One tree declining in a block = spot problem. Act fast to save it and protect the others.