Honey bees can be a bit like teenagers… sometimes they seem calm and content, and other times, they’re just downright cranky. Unlike teens, however, beekeepers can usually pinpoint the reasons behind their hive’s mood swings.
Aggressive bees can be a challenge for any beekeeper. If your bees suddenly become defensive, they might attack or chase you away while you’re simply trying to perform routine tasks like hive inspections or feeding. This kind of behavior is not only inconvenient, but it can also be dangerous for both you and the bees.
While bees are generally docile during the spring and early summer, it’s common to see a change in temperament as the colder months approach. Bees tend to become more defensive in late summer and fall when they’re focused on collecting and storing honey for winter. They grow protective of their hive, knowing that the survival of the colony depends on it.
However, shifts in bee behavior don’t always follow a predictable pattern. If your bees suddenly become more aggressive, it’s important to troubleshoot and figure out what might be causing the change.
5 Reasons Why Your Bees are Suddenly Aggressive
1. Lack of Nectar
One of the most common causes of sudden aggression in bees is a nectar dearth. A nectar dearth occurs when there is little or no available nectar for bees to collect, often happening during seasonal transitions. The timing of this dearth can vary depending on your region, but it typically strikes in late summer or early fall when flowers begin to fade.
Signs of a Nectar Dearth:
Louder bees: If your bees are buzzing more loudly than usual or hanging around the entrance, they may be frustrated and hungry due to the lack of nectar.
Strange flower behavior: Bees may revisit flowers they’ve already foraged from or even try flowers they typically avoid when nectar is scarce.
Robbing: Hungry bees may become aggressive and start robbing other hives for their honey. This can lead to fights between colonies and is often a sign of desperation.
Increased visibility: During a nectar dearth, bees will be more visible around the hive as they search aggressively for food. You may even notice them flying low and checking out anything that smells like a potential food source, including your beekeeping tools or candles.
How do I solve this problem?
If you notice a nectar dearth, it’s a sign that your bees aren’t collecting enough nectar to sustain themselves. In this case, feed your bees a sugar-water mix or a bee syrup to help them through the shortage. Keep an eye on how much they consume; once they stop taking the syrup or are eating much less, it’s a sign that nectar is becoming available again, and you can stop feeding them.
2. Bad Weather
Bees can become noticeably more aggressive when the weather is less than ideal. They are particularly sensitive to rain, excessive heat, high humidity, and wind. When the weather turns unfavorable, bees are forced to spend more time inside the hive, which can lead to irritability and aggression.
Rain: Bees prefer to stay inside during rainy days, and when forced to remain cooped up, they become restless and more likely to act defensively.
Hot and Humid Weather: On very hot and humid days, worker bees face challenges in maintaining a stable environment within the hive. Humidity makes it difficult for bees to properly dry nectar into honey, as they can’t fan their wings fast enough to evaporate the moisture. The high moisture levels also make it harder for them to regulate the temperature inside the hive. This stress can lead to more defensive behavior.
Wind and Clouds: Bees don’t enjoy flying in strong winds or cloudy weather either. When wind picks up or the sky becomes overcast, they are less likely to forage and more likely to become agitated, which can make them more prone to aggression.
How do I solve this problem?
While you can’t control the weather, you can take steps to minimize stress on your bees during challenging conditions. Provide your bees with plenty of space inside the hive to spread out, and make sure their hive is well-ventilated to help with cooling on hot days. During rainy or excessively windy weather, limit your hive inspections to reduce stress, and ensure the bees have enough food stored to survive through any inclement weather.
3. Robbers & Predators
When nectar becomes scarce, bees may resort to robbing other hives for their honey. Robbing behavior is a serious issue that can cause a dramatic increase in aggression among the bees. Both the robbing bees and the hive being robbed become defensive and fight to protect their resources, which can result in highly aggressive behavior.
Signs of Robbing:
Fighting at the Hive Entrance: You may notice bees aggressively battling each other at the entrance of the hive, as robbing bees attempt to enter.
Dead Bees on the Ground: If bees are fighting over the entrance, it’s common to see dead bees lying on the ground in front of the hive.
A “Cloud” of Bees: When robbing is occurring, you might observe a dense cluster or “cloud” of bees flying around the hive, as the robbing bees attempt to overwhelm the hive and steal the honey.
In addition to robbing, other predators may also be threatening your hive, contributing to the bees’ aggressive behavior. Skunks, raccoons, mice, and even bears can become a threat to your hive, especially at night. These predators are often drawn to the hive by the smell of honey, and the bees will defend their colony with aggression to protect their food stores.
How do I solve this problem?
If you see robbing in your hive, be sure to act quickly. When bees fight, they release an alarm pheromone. This is an odor that warns the colony that danger is close. As the fighting intensifies, so does the pheromone. If there are dead bees, they also release a pheromone that attracts other predators such as wasps and yellow jackets. It’s important to take action as soon as you notice robbers around your hive. You can stop a hive attack by reducing the size of the entrance using an entrance reducer. This will only allow one bee to enter the hive at a time.
Always inspect the surrounding of the hive for any signs of a predator lurking close by. Skunks and raccoons will attempt to get close to the hive at night during the summer. Check on your hive at night, if possible, and take proper measures to stop predators from getting too close.
When you are inspecting a hive, don’t leave it open for longer than 10 minutes. The long exposure not only riles up the bees, but the smell of honey can attract predators. Robber bees could be flying by and become aware of the honey in your hive. If you notice robbing in your hive, act quickly. Bees release alarm pheromones when they fight, which signals danger to the entire colony. As the conflict escalates, the pheromone scent becomes stronger, attracting more robbing bees and even predators like wasps and yellow jackets. Dead bees release similar pheromones, which can further draw in unwanted attention.
To prevent robbing, reduce the hive entrance using an entrance reducer. This limits the entry to a single bee at a time, making it harder for robbers to invade.
Additionally, inspect the surrounding area for predators. Skunks, raccoons, and even mice are known to target hives, especially at night during summer months. If possible, check your hive after dark to spot any predators and take measures to prevent them from getting too close.
Also, when inspecting your hive, be mindful of how long the entrance is open. Keep the hive closed for no more than 10 minutes to minimize the chances of attracting robbers or predators. Prolonged exposure not only agitates the bees but also increases the scent of honey, which can invite unwanted visitors.
4. The Hive is Queenless
A sudden shift in behavior can sometimes be attributed to a missing or dead queen. If a colony loses its queen, whether through death, injury, or accidental removal by the beekeeper, the workers will recognize the absence and begin the process of requeening. During this time, the hive can become particularly agitated as they work to restore order.
Signs that your hive may be queenless:
No New Brood or Eggs: The queen is the sole fertile female responsible for laying eggs. Without her, the hive will no longer produce brood (eggs and larvae). Regularly inspecting the brood chamber will reveal whether the hive is queenless.
Decreased Bee Population: A queenless hive will quickly experience a drop in population, as no new eggs are being laid. If you notice a significant decline in the number of bees, the absence of a queen may be the cause.
Increased Honey Stores: Worker bees typically focus on tending to the brood, but without a queen, they shift their attention to foraging. As a result, you might notice an increase in honey production, as the worker bees have more time to gather nectar.
Queen Cells: If the colony is in the process of requeening, you may spot queen cells. These special cells are designed to nurture a new queen. They are usually larger than regular brood cells and have a distinct “cave” shape.
How do I solve this problem?
If you discover that your hive is queenless, the best solution is to requeen the colony. Requeening can restore stability and help calm the hive. Here’s how to introduce a new queen to a queenless colony:
Purchase a New Queen: Select a queen with a gentle temperament to help ensure a calm hive. Be sure to buy from a reputable supplier to ensure the queen is healthy and well-mated.
Introducing the Queen: When you introduce the new queen, place her in a queen cage with a candy plug. This allows the worker bees to get acquainted with her slowly and helps prevent them from attacking her. The bees will eat through the candy plug over a few days, gradually releasing the queen into the colony.
Give the Hive Time to Adjust: After introducing the new queen, give the hive about a week to adjust. During this time, the workers will become familiar with her scent and accept her as their new leader. During this period, avoid disturbing the hive too much.
Inspect the Hive After a Week: After about seven days, you can resume normal hive inspections. Check to ensure that the queen has been released and is laying eggs.
Important Note: The temperament of the queen has a direct impact on the overall mood of the colony. A gentle queen will help foster a calm, docile hive, while an aggressive queen may instigate heightened aggression among the worker bees. If the new queen is aggressive, consider replacing her with a calmer queen to keep the colony peaceful.
5. Improper Hive Manipulation
Bees are naturally protective of their home, and improper hive manipulation can lead to aggressive behavior. When you open the hive to inspect or perform other tasks, you’re entering their personal space. If the bees perceive you as a threat, they will become defensive.
Some common mistakes that can provoke bees include:
- Fast Movements: Quick, jerky actions can startle bees, causing them to feel threatened and more likely to attack.
- Smushing Bees: Accidentally crushing or pinching bees during inspections can trigger defensive behavior. Even if you’re not aware, squashing a bee can release alarm pheromones that signal the colony to go on high alert.
- Excessive Disturbance: Opening the hive too frequently or for extended periods can stress the bees and make them more likely to become aggressive.
How do I solve this problem?
If your hive becomes more aggressive after an inspection, consider making these adjustments to keep your bees calm and docile:
Inspect at the Right Time: Conduct inspections during the late morning or early afternoon when most of the forager bees are out collecting nectar. This minimizes the number of bees in the hive, reducing the potential for aggression.
Choose Optimal Weather: Aim for clear, calm days with mild temperatures. Bees are more likely to be agitated during rain, wind, or extreme heat, so it’s best to inspect your hive when the weather is ideal.
Move Slowly and Gently: Always use slow, deliberate movements when handling the hive. This will help prevent startling the bees and reduce the risk of provoking them.
By making these adjustments, you can minimize the disturbance to your hive and reduce the likelihood of aggressive behavior.
Tips on Handling Aggressive Bees
Sometimes, even with all the precautions, you still need to inspect or manipulate a hive with aggressive bees. If you find yourself in this situation, follow these tips to safely conduct your hive work:
Remain Calm: Staying calm is essential when working with aggressive bees. It’s completely natural to feel nervous, especially if you’re a new beekeeper, but the more you practice, the easier it will become. Bees are very intuitive creatures—they can sense your emotions and energy. Much like a dog or horse, if you approach them with fear or uncertainty, they will pick up on it and respond accordingly. Take deep breaths, stay composed, and remind yourself that you’re in control. For more tips, see our article on alternative ways to keep bees calm.
Wear Protective Gear: Full-body protection is crucial when dealing with aggressive bees. A beekeeping suit provides reliable coverage to shield you from stings and offers peace of mind when you’re working with a more temperamental hive. If you choose not to wear a full suit, opt for light-colored clothing like white or pastels. Bees are less likely to become agitated by lighter colors. See our list of the top beekeeping suits for all levels of beekeepers.
Use a Smoker: A smoker is an essential tool for calming bees during inspections. It works by masking the pheromones bees release to communicate with each other and signal danger. The smoke also mimics the scent of a forest fire, prompting the bees to fill up on honey in preparation to flee. A “full” bee is a calm bee. Before opening the hive, give a few puffs of smoke at the entrance to help settle the bees and reduce aggression.
Final Thoughts
As the summer winds down and bees prepare for winter, it’s natural for them to become more defensive. With their precious honey stores secured, they are instinctively protective of their hive. However, if your bees become excessively aggressive, it’s important for you, as the beekeeper, to identify the cause and address the issue. Regular inspections, combined with thoughtful precautions before opening the hive, can make all the difference in maintaining a healthy, thriving colony.
