Spring in Andover brings blooming trees, warmer afternoons, and unfortunately the return of one of the most persistent warm-weather pests homeowners deal with: carpenter bees. Many residents first notice these large, glossy bees hovering around decks, eaves, wooden railings, or fence posts as temperatures climb in April. At first glance they can be mistaken for bumblebees, but their behavior quickly sets them apart. Rather than pollinating flowers, they are methodically inspecting wooden surfaces, searching for the right spot to drill.
What looks like aimless hovering is actually purposeful scouting. Carpenter bees bore near-perfect circular holes, roughly half an inch in diameter, into untreated or weathered wood to create nesting tunnels. These tunnels can extend several inches deep into a beam or board, and the same entry holes are reused and expanded year after year. In Andover, where homes with wooden decks, cedar siding, pergolas, and barn-style outbuildings are common, carpenter bee activity can cause meaningful structural damage if left unaddressed season after season.
Why Andover Properties Are Frequently Targeted
Carpenter bees have a strong preference for bare, unpainted, or weathered softwoods. Pine, cedar, redwood, and fir are among their favorites — all materials widely used in deck construction, fascia boards, wooden fences, and outdoor furniture throughout the Andover area. Homes surrounded by mature trees and natural landscapes, which describe much of Sussex County, tend to see higher carpenter bee pressure simply due to the proximity of natural nesting sites and the abundance of exposed wood on residential structures.
Female carpenter bees return to the same locations each spring, often reusing tunnels from previous years and excavating new branches off existing ones. A deck that had minor activity last spring can have a significantly worse infestation the following year if no preventive measures were taken over winter.
Understanding the Damage They Cause
The entry hole itself is only part of the problem. Inside, the tunnel turns sharply and runs with the grain of the wood, sometimes extending six inches or more. Females lay eggs inside these galleries, provisioning each chamber with pollen for larvae to feed on after hatching. Over multiple seasons, a single board can contain numerous interconnected tunnels that hollow out the interior while leaving the surface largely intact — making the damage invisible until the wood begins to crack, splinter, or fail under load.
Woodpeckers compound the problem significantly. They are attracted to the larvae inside carpenter bee tunnels and will aggressively peck into infested wood to extract them, causing damage far beyond what the bees alone would create. If you notice both carpenter bee holes and erratic woodpecker activity on your home’s exterior, the underlying infestation is likely more advanced than it appears.
Why Early Season Treatment Matters
Carpenter bees are most active and most vulnerable to treatment in spring, before females have sealed off their egg chambers deep inside the tunnels. Treating early in the season — before nesting is fully underway — is far more effective than waiting until summer when larvae are protected inside sealed galleries. Professional treatment typically involves applying residual insecticide directly into active tunnels and along surfaces where bees are landing and drilling, followed by sealing entry holes after treatment to prevent reuse.
Painting or staining exposed wood is one of the most effective long-term deterrents, as carpenter bees strongly prefer bare surfaces. However, for existing infestations, surface treatments alone are not sufficient to eliminate the problem.
Frequently Asked Questions
Are carpenter bees aggressive? Male carpenter bees hover and can appear threatening, but they have no stinger and cannot sting. Females are capable of stinging but are docile by nature and rarely do so unless directly handled or threatened.
Do carpenter bees damage homes? Yes. While a single season of activity may seem minor, repeated drilling and nesting across multiple years can significantly weaken decks, fascia boards, railings, and other wooden structures. Woodpecker activity associated with carpenter bee infestations can accelerate that damage considerably.
When do carpenter bees appear in NJ? Carpenter bees typically emerge in April and remain active through June, with peak nesting activity occurring in late April and May across most of Sussex County.
How are carpenter bees controlled? Professional treatment targets active tunnels with residual insecticide, seals entry points to prevent reuse, and identifies the most vulnerable areas of the home for preventive treatment. Painting or sealing exposed wood provides long-term protection against future nesting.
If carpenter bees are drilling into your Andover home this spring, don’t wait for the damage to add up. Contact BUSTABUG today at (201) 347-5943 or fill out our contact form to schedule an inspection and protect your wood before nesting season gets fully underway.