White Pine Weevil Activity on Landscape Trees

The white pine weevil (Pissodes strobi) is a notorious pest that has been making its presence felt in our area, causing significant damage to pine and, occasionally, spruce trees. The damage caused by the white pine weevil is quite distinctive and often goes unnoticed until it's too late. In early spring, female weevils begin their assault on the terminal leaders of young trees, typically those under 25 feet tall.

They lay eggs in small holes they create, which ooze sap - the first sign of infestation. As summer approaches, the eggs hatch, and the larvae tunnel under the bark, disrupting the tree's nutrient flow. This results in the characteristic wilting and browning of the tree's top, often forming a "shepherd's crook" appearance. By fall, the damage becomes more apparent as the needles drop and the leader dies. The consequences of white pine weevil infestation are far-reaching. Affected trees often develop multiple trunks and bushy tops, significantly affecting the growth pattern and structure of the tree.

In severe cases, repeated attacks can stunt growth and even kill smaller trees .To combat this pest, various management strategies can be employed. These include manual pruning of damaged leaders. For ornamental trees, spring insecticide applications can be effective when applied early in the growing season.

As we move forward, it's crucial for property owners to remain vigilant. Early detection and prompt action are key to minimizing the impact of the white pine weevil and preserving the health and beauty of your pine and spruce trees.