Robbing Behavior: How to Stop It

Robbing happens when forager bees from a strong hive steal honey and pollen from a weaker one. It’s one of the most destructive behaviors you’ll encounter as a beekeeper, capable of wiping out a struggling colony in days. Learning to spot it early and take action quickly can save your bees.

How to Recognize Robbing in Progress

Robbing looks chaotic in a way that normal foraging doesn’t. During normal foraging, bees move purposefully in and out of the entrance with a steady rhythm. Robbers fly erratically around the hive entrance, bumping into it, trying multiple entry points, and moving in a disorganized swarm. You’ll see bees fighting at the entrance—the defending bees try to block the robbers, and you’ll notice actual combat, not just crowding.

The defending colony’s behavior changes noticeably. Guard bees become frantic and aggressive, and you may see dead bees piling up outside. The entrance looks like a small battle zone. If you open the hive during robbing, you’ll see bees frantically moving comb to comb with no clear purpose.

Robbing typically happens during a nectar dearth, when there’s little forage available. It’s worse in late summer and fall. If you see this behavior during a season when bees should be foraging normally, it’s probably not robbing—it’s just normal activity. But if it’s late August and you see frantic behavior at a weak hive’s entrance while a strong hive nearby is calm, robbing is almost certainly happening.

Reducing the Entrance

The quickest fix is to make the entrance smaller. A strong robber bee can force its way through a large opening, but a small entrance forces robbers into a bottleneck where guard bees can defend more effectively. This is your first line of defense and costs almost nothing.

Use an entrance reducer—a simple wooden or plastic strip with an elongated slot (typically ⅜ inch high × 3–4 inches wide) that slides into the entrance. If you don’t have a reducer, prop a piece of wood or a spare frame part against the entrance to leave only a small gap. The goal is to make the entrance just large enough for your own bees to pass through comfortably, but difficult enough for robbers to enter that your guards can repel them.

Reduce the entrance to the smallest practical size. Your bees need to be able to get in and out without jamming up, but robbers should struggle. Check the entrance after an hour—if your own foragers are backing up and having trouble entering, the opening is too small. If you still see chaotic fighting, go smaller.

This alone often stops robbing within a few hours. The defending bees, now fighting in a narrow space, can hold the line. As the robbers realize they’re losing, they give up and go home. Leave the reducer in place for at least a week after robbing stops, then gradually enlarge it over several days.

Robbing Screens

A robbing screen is a mesh panel that attaches to the entrance, forcing bees to walk through a maze-like structure before entering the hive. Robbers, which are disoriented and aggressive, struggle with the extra steps. Your own bees, which know the hive layout, navigate it quickly.

You can buy robbing screens (they cost $10–20) or make one from hardware cloth and scrap wood. The screen needs to extend at least 6 inches out from the entrance and be angled slightly downward. Bees enter at the bottom and have to crawl up and around to find the actual entrance hole.

Robbing screens work well, but they’re not a first response—use them if entrance reduction alone isn’t stopping the robbing after a few hours. They also slow down your own foragers slightly, so don’t leave them on longer than necessary. Once robbing stops, remove the screen and keep just the entrance reducer in place for a few more days.

Preventing Robbing Before It Starts

The best robbing prevention is never letting a hive become weak and exposed. Keep entrances small year-round during nectar dearths, especially in late summer. A ⅜-inch entrance slot is standard for many beekeepers in fall.

Don’t leave open hives unattended during inspections. Robbers can sense exposed honey in minutes. Work quickly, close the hive, and move away. If you’re feeding a weak hive, do it inside the hive (using a frame feeder or internal feeder) rather than with an open entrance feeder, which advertises food to robbers.

Remove dead hives and failed colonies promptly. An empty hive with residual honey is an open invitation to robbers and can trigger robbing of nearby colonies. If a hive dies, close it up immediately and remove it from the apiary or store it sealed until you can clean it.

Keep your strong hives strong. A healthy, populous hive won’t be robbed successfully. Ensure adequate food stores, manage for disease, and avoid creating a situation where one hive is obviously struggling while others are thriving.