You Found Bees. Here Is How to Tell What You Are Looking At

Finding bees on your property is usually less of an emergency than it feels like, and the most useful thing you can do in the first ten minutes is work out which of two very different situations you have. A swarm is a colony on the move, hanging in the open, with no comb, no honey, and nothing to defend. An established hive is a colony that already moved into a cavity and started building. One of those is a short, inexpensive visit. The other is a construction job. Telling them apart is not hard.

UC statewide IPM puts the biology plainly: swarming is how honey bees reproduce as colonies. When a hive gets crowded in spring, the old queen leaves with a large share of the workers, they cluster somewhere temporary while scouts hunt for a permanent cavity, and then they commit. The cluster stage lasts hours to a couple of days, occasionally a bit longer in cool weather. Almost everything about how you should respond, and most of what it will cost you, depends on whether you caught them inside that window or well after it closed.

How to tell a swarm from an established hive

Look at the shape first. A swarm is a clump, often somewhere between a football and a basketball, sometimes much bigger, hanging off a branch, a fence rail, a mailbox, a barbecue handle. The bees are piled on each other, not on anything they built. No wax is visible. It appeared suddenly, frequently within an hour, and people almost always describe the arrival as loud.

An established colony looks like traffic instead of a clump. There is a steady two-way stream of bees using one specific hole, and the hole is usually small enough to miss: a gap at a stucco weep screed, a crack at a corner, a knot in siding, a torn vent screen, the seam under a tile roof edge. If you can hear a hum through the wall on a hot afternoon, or you find a warm patch on the drywall inside, there is comb in there.

What not to do

Most expensive bee problems started with a reasonable-sounding decision made in the first hour. A short list of the moves that make things worse:

• Do not spray them, from a can or a hose-end sprayer, because it rarely reaches the whole colony and it does nothing at all about the comb.
• Do not plug or seal the entrance while bees are inside, since trapped bees often chew through into the room instead of quietly dying.
• Do not hose a swarm off a branch, because a soaked cluster becomes an agitated cluster on the ground where people walk.
• Do not run a mower, blower, chainsaw, or pressure washer near an active colony, since vibration and noise are the two most reliable ways to provoke one.
• Do not send someone up a ladder for a closer look, because the two things that go wrong at height are stings and falls, and the falls are worse.
• Do not patch a wall over a dead colony, because the comb and honey stay behind and turn into a second, slower problem.

Keeping people and pets clear while you wait

Distance is the whole strategy. Move the activity in your yard away from the entrance rather than trying to move the bees, and give it more room than feels necessary. Bring dogs inside, especially the ones that bark at things, and relocate any penned or tethered animal well away, because an animal that cannot leave is the most common serious sting case there is. Keep kids off that side of the house entirely and shut the windows on that wall.

If someone does get stung, scrape the stinger out sideways with a fingernail or a card rather than pinching it, wash the site, and ice it. Ordinary local swelling that fades over a day or two is normal and is not an allergic reaction. Trouble breathing, throat tightness, hives spreading away from the sting, dizziness, or vomiting are a 911 call, not a wait-and-see. Anyone with a known sting allergy should be off the property while the work happens.

Why the comb is the real problem

Homeowners think of a bee job as removing bees. In a structure, the bees are the easy half. A colony that has been in a wall for a season or more has built pounds of wax comb loaded with honey and brood, and all of it has to come out. UC IPM does not soften this: taking a colony out of a structure requires opening a fairly large hole. Anyone promising a real extraction with no opening is either not doing an extraction or not telling you the whole plan.

Comb left in a wall creates a second problem on a delay. With no workers left to fan it, honey inside a Fresno wall cavity is sitting in a hot box. It ferments and seeps, and drywall is not a barrier. Ants, wax moths, and rodents find it. The leftover wax and propolis scent is also a strong advertisement to next spring's scouts, which is why a house that has had one colony so often gets another in the same wall.

Bee proofing once they are out

A removal is only finished when the cavity has been cleaned and the entrance is closed. Cleaning means scraping out comb and residue and treating the surfaces so the site stops smelling like a hive. Closing means sealing the actual entry point and then dealing with the six others just like it a few feet away, because a scout bee that found one gap has usually found three.

The gaps worth checking on a typical Valley house are predictable: stucco weep screeds and corner cracks, the joint where the roofline meets the wall, unscreened attic and gable vents, torn or missing screens, the gap around a bathroom or dryer exhaust, unlined chimney flues with no proper cap, openings under tile roof edges, and the lids on water meter and irrigation valve boxes. Hardware cloth, mortar, caulk, and a Saturday cover most of it.