What does smoke do to bees when a beekeeper sends a few puffs into the hive? Surprisingly, the bees often become less defensive, even though smoke normally signals danger.
This reaction is not caused by sleep or sedation. Depending on its concentration, temperature, source, and exposure time, smoke can calm bees, disrupt their normal activity, or even cause harm. Here is a closer look at these different effects.
1. Smoke can calm bees down.
Smoke calms bees mainly by disrupting their alarm pheromones and triggering their instinctive response to fire. This makes it harder for the colony to coordinate an attack while shifting the bees’ attention toward preparing for possible danger. Let’s explore how these responses work.
Smoke disrupts their alarm pheromones.
When guard bees detect a threat, they release alarm pheromones that encourage other workers to defend the hive. One important component of this warning signal is isopentyl acetate.
Smoke reduces the bees’ ability to detect these pheromones. When the warning cannot spread effectively, fewer bees join the defensive response, making a coordinated attack less likely.
Smoke is therefore more like a temporary communication barrier than a sedative. Individual bees can still move, fly, and sting after exposure.
Smoke triggers their instinctive response to fire.
Bees may interpret smoke as a sign of a nearby fire. They may retreat farther into the hive and focus on preparing for the emergency.
This shift in attention gives the beekeeper an opportunity to inspect the colony with less defensive activity.
However, this does not mean that smoke makes bees completely passive. A bee that is crushed, trapped, or directly threatened may still sting.
Smoke encourages them to consume honey.
Smoke can also trigger workers to consume honey, preparing them for the possibility of leaving the hive.
It is often suggested that a honey-filled abdomen is harder to bend into the position required for stinging. However, this explanation has less scientific support than the disruption of alarm pheromones.
Experienced beekeepers may listen to changes in the colony’s buzzing to judge its response. If the bees still sound agitated, they may wait or apply another small amount of cool smoke rather than continuously increasing the smoke.
Together, these responses make the colony less likely to organize a defensive attack. This is why beekeepers use a bee smoker to release controlled puffs of cool smoke during hive inspections.
Heavy smoke can disrupt normal bee activity.
Although smoke can calm bees, heavy or prolonged exposure may interfere with the senses they use to navigate and locate food. During smoky conditions, some colonies may reduce foraging and keep more workers inside the hive.
This response has been observed during wildfires. A beekeeper reported little activity outside several hives during heavy wildfire smoke. The bees remained unusually passive during an inspection and showed almost no response to additional smoker smoke.
However, other colonies continued foraging under similar conditions. The effects of heavy smoke may vary according to its concentration, duration, weather, food availability, and the condition of the colony.
2. Hot smoke can injure or agitate bees.
Smoke temperature is just as important as concentration. Cool smoke can calm bees, while hot smoke may injure them or trigger defensive behavior.
Hot smoke can burn their bodies or damage their delicate wings. Sparks and burning particles may also harm bees, damage the comb, or create a fire risk.
Heat can make the colony more agitated. The bees may buzz more loudly, move rapidly across the frames, or fly toward the disturbance.
Therefore, a good bee smoker should produce cool smoke without releasing hot air, flames, or sparks. Beekeepers usually pass a hand through the smoke before directing it toward the hive. If it feels uncomfortably hot, it is too hot for the bees.
3. Contaminated smoke can harm bees and the hive.
Contaminated smoke may harm adult bees, brood, and the queen. It may also leave unwanted odors or chemical residues on wax, stored pollen, and honey.
The COLBOR CF5 bee smoker uses a food-grade, plant-glycerin-based liquid that is colorless and odorless. It also produces no ash, sparks, or burned-fuel residue that could enter the hive.
In contrast, avoid burning the following synthetic or chemically treated materials because they may release toxic gases and residues around bees:
- Plastic
- Painted or pressure-treated wood
- Synthetic fabrics
- Glossy or coated paper
- Rubber
- Materials contaminated with fuel, oil, or pesticides
Cigarettes and cannabis are not suitable smoker fuels either. Their smoke contains chemicals and fine particles that may harm bees or contaminate the hive.
Conclusion
Smoke affects bees differently depending on how much they encounter, how hot it is, and what produced it.
A small amount of cool, clean smoke can interrupt alarm pheromones, trigger fire-related behavior, and temporarily calm a colony. Heavy smoke can disrupt foraging and navigation, while hot or contaminated smoke may agitate, injure, or poison bees.
Smoke should therefore be treated as a controlled signal rather than a harmless substance. Its purpose is to briefly reduce defensive behavior - not to overwhelm the hive.
FAQ
Here are short answers to other common questions about how bees respond to smoke.
What does smoke do to honey bees?
Smoke disrupts the alarm pheromones honey bees use to warn one another. It may also trigger fire-related instincts and honey consumption, temporarily making the colony less defensive. However, hot, heavy, or contaminated smoke can disturb or harm the bees.
Do bees like smoke?
No. Bees do not seek out or enjoy smoke. They generally interpret it as an environmental disturbance or a sign of possible danger.
Will smoke kill bees?
Small amounts of cool, clean smoke usually do not kill bees. However, excessive, hot, or toxic smoke can injure or kill them.
Are bees attracted to weed smoke?
There is no reliable evidence that bees are attracted to cannabis smoke. It should not be used as an alternative to appropriate bee smoker fuel.
Are bees attracted to cigarette smoke?
No. Cigarette smoke does not attract bees and may expose them to nicotine and other harmful combustion products.
Can you smoke bees out of a hive?
Smoke may cause bees to move away from a particular area, but it cannot reliably force an entire colony to leave its hive. Using excessive smoke for removal may harm the bees or create a fire risk.
Are bees afraid of smoke?
Bees do not necessarily experience fear in the human sense. However, they detect smoke as a possible threat and change their behavior in response.
Does smoke keep bees away?
Smoke may make worker bees retreat from a particular area, but it cannot reliably force the entire colony to leave. A laying queen is usually too heavy to fly immediately, and the workers are unlikely to abandon her, the brood, and their food stores. Excessive smoke may harm the colony or create a fire risk.
Does smoke put bees to sleep?
No. Normal bee smoker smoke does not make bees sleep. It temporarily disrupts their chemical communication and changes their response to danger.