Beekeeping is an incredibly rewarding pursuit, but it comes with its share of challenges. Among the various pests and threats that can affect a hive, the small hive beetle (Aethina tumida) is one of the most troublesome for beekeepers, particularly in warmer climates. These invasive pests can cause severe damage to bee colonies if left unchecked, leading to weakened or even collapsed hives.
Understanding small hive beetles—what they are, how they infest hives, and how to manage them effectively—is crucial for any beekeeper. This guide will walk you through everything you need to know about small hive beetles, from identifying them to implementing the best strategies for treatment and prevention. By the end of this article, you’ll be equipped with the knowledge and tools to keep your beehives safe and thriving.
What are Small Hive Beetles?
Small hive beetles (SHB) are invasive pests native to sub-Saharan Africa. They were first identified as a significant beekeeping threat in the United States in the late 1990s and have since spread to many other regions, including Australia, Canada, and parts of Europe.
Adult small hive beetles are about 5 to 7 millimeters long and have a dark brown to black oval-shaped body. They are strong fliers and can travel several miles in search of new hives to infest. The larvae are pale, worm-like, and grow up to 10 millimeters in length before they pupate in the soil outside the hive.
Small hive beetles are scavengers, feeding on pollen, honey, and bee brood. They reproduce rapidly, with females laying hundreds of eggs in hive crevices and comb. Once hatched, larvae can quickly overwhelm a hive, contaminating honey with their feces and causing the colony to abandon its home.
How Small Hive Beetles Affect Bee Colonies
Small hive beetles pose a severe threat to honeybee colonies, especially if they are not managed properly. Their presence can lead to several detrimental effects:
Comb and Honey Destruction – SHB larvae tunnel through comb, consuming honey and pollen. As they feed, they cause significant structural damage to the wax foundation, leading to a slimy, fermented mess. This destruction weakens the hive’s internal structure, making it more difficult for bees to store food properly and build new comb.
Honey Contamination – One of the most devastating effects of an SHB infestation is their ability to contaminate honey. The larvae excrete a yeast that ferments honey, giving it a characteristic sour odor. This tainted honey becomes unpalatable for both bees and humans, and in severe cases, it liquefies, oozing from the frames and making it unusable.
Colony Stress and Collapse – A severe SHB infestation can stress the colony to the point where bees abscond, abandoning the hive entirely. This is particularly problematic in weak or small colonies that do not have enough worker bees to defend the hive. The disruption of their living environment causes bees to relocate, leaving behind a destroyed comb and unusable honey stores.
Queen Disruption – SHB larvae and adults can disturb the brood area, causing the queen to reduce or stop laying eggs. This leads to a weakened colony with fewer new bees emerging to replace older workers. Over time, if the queen is unable to lay enough eggs to sustain the colony, the population will dwindle, making the hive more susceptible to other threats, such as wax moths or varroa mites.
Spread to Other Hives – Since adult beetles are capable of flying, an infested hive can become a source of infestation for nearby colonies. This makes early detection and management critical. Beekeepers who have multiple hives must be particularly vigilant, as SHB can easily migrate between colonies, rapidly escalating a small problem into a full-blown infestation across an entire apiary.
How to Treat Small Hive Beetles in a Hive
If you discover an SHB infestation in your hive, immediate action is necessary to prevent further damage. There are several effective methods for treating small hive beetles, including manual removal, trapping, and chemical treatments.
1. Manual Removal
Regular hive inspections are crucial in detecting SHB early. When inspecting your hive:
Squash any adult beetles you see hiding in the corners of frames or under the hive cover.
Remove contaminated comb and dispose of it properly to prevent larvae from further spreading.
Shake frames over a bucket of soapy water to dislodge beetles, which will drown in the solution.
2. Traps and Biological Controls
There are several traps designed to catch and kill SHB without harming bees:
Beetle Blaster Traps – These small plastic traps contain oil or a beetle-killing substance that attracts and drowns adult SHB.
Swiffer Pads – Unscented Swiffer sheets placed in the hive can trap beetles by catching their legs as they try to move through the hive.
Beetle Jail Traps – These traps use apple cider vinegar or mineral oil to lure and kill beetles while keeping bees safe.
Beneficial Nematodes – These microscopic worms can be applied to the soil around the hive to target and kill pupating beetle larvae before they emerge as adults.
3. Chemical Treatments
In severe cases, beekeepers may resort to chemical treatments to control SHB populations. Some commonly used methods include:
CheckMite+ Strips – Placed in the hive, these strips contain coumaphos, an insecticide that kills SHB.
Permethrin Soil Treatments – Applied to the ground around the hive, permethrin kills SHB larvae as they attempt to pupate.
Diatomaceous Earth – A natural, non-toxic powder that can be sprinkled around the hive to dehydrate and kill beetle larvae.
4. Freeze or Burn Infested Frames
If SHB larvae have overrun the hive, freezing the affected frames for at least 48 hours can kill all larvae and eggs. Alternatively, burning infested comb is an effective way to prevent SHB from continuing their lifecycle.
5. Reduce the Hive Space
SHB thrive in hives that have excess space, which provides them with more hiding spots. Reducing the number of frames in weak colonies and ensuring that all space is actively occupied by bees can help limit SHB spread.
6. Using Chickens or Other Ground Predators
Since SHB larvae pupate in the soil, having free-ranging chickens or other insectivorous birds around your apiary can help control SHB populations naturally by eating larvae before they mature.
By implementing a combination of these treatment strategies, beekeepers can effectively manage SHB infestations and prevent them from causing severe damage to their colonies.
How to Prevent Small Hive Beetles
Prevention is the best strategy for keeping SHB populations under control. Beekeepers should adopt a multifaceted approach that includes hive management, environmental controls, and strategic interventions to reduce the likelihood of an infestation. Below are some key preventive measures:
Strong Colony Management – A strong, well-populated colony with an active queen is a hive’s best defense against SHB. Bees are excellent at managing small pest invasions when their numbers are high. Keeping a healthy queen, ensuring ample food supply, and avoiding excessive hive disturbances will help the colony remain strong enough to ward off SHB invasions.
Reduce Hive Gaps and Minimize Hiding Spots – Small hive beetles prefer to hide in dark, tight spaces within the hive where bees cannot easily reach them. By reducing the number of gaps between frames and ensuring a proper fit for all hive components, you can limit the areas where beetles can take refuge. Regularly inspecting and repairing damaged equipment will also help keep beetles from finding harborage.
Proper Hive Placement – Hive location plays a significant role in SHB prevention. Small hive beetles thrive in warm, humid, and shady environments. Placing hives in full sunlight discourages SHB infestations since they prefer cooler, shaded conditions. Additionally, placing hives on elevated stands can make it more difficult for beetle larvae to reach soil and complete their pupation cycle.
Monitor and Control Moisture – High humidity and excessive moisture create the perfect breeding conditions for SHB. Ensuring proper ventilation inside the hive and keeping the ground around hives well-drained helps to reduce favorable conditions for SHB development. Avoid placing hives in low-lying, damp areas where moisture accumulation is common. You can ensure proper ventilation any time of the year by using a thermal imaging camera. Check out our list of the top thermal imaging cameras for beekeeping.
Use Beetle-Resistant Hive Designs – Some hive designs help mitigate SHB infestations by limiting their ability to hide and reproduce. Screened bottom boards, beetle traps, and specialized hive covers can all contribute to reducing SHB populations before they become a problem. Some beekeepers use oil-based traps placed in the hive to capture and kill beetles before they can lay eggs.
Clean Up Apiary Debris – A tidy apiary is less inviting to SHB. Remove old comb, dead bees, discarded wax, and any other hive debris that could attract beetles. Fallen comb and rotting materials provide an excellent breeding ground for SHB larvae, so cleaning up around the hives can significantly reduce their numbers.
Monitor Hives Regularly – Frequent hive inspections are one of the best ways to prevent a full-blown SHB infestation. Beekeepers should check for adult beetles, larvae, and signs of honey contamination at least every two weeks, especially in warm climates. Catching an infestation early allows for quicker intervention and prevents long-term damage to the hive.
Use Beneficial Nematodes for Soil Treatment – Since SHB larvae pupate in the soil around hives, treating the ground with beneficial nematodes (Heterorhabditis bacteriophora or Steinernema carpocapsae) can help reduce SHB populations. These microscopic organisms attack and kill SHB larvae before they can develop into adults.
Avoid Feeding Excess Pollen Patties – Pollen patties are an excellent source of nutrition for bees, but they also attract SHB. If pollen patties are necessary, be sure to use them sparingly and remove any uneaten portions quickly to prevent attracting beetles.
Implement an Integrated Pest Management (IPM) Approach – Prevention works best when combined with active monitoring and responsive action. Using a combination of traps, biological controls, and proper hive maintenance will create a comprehensive strategy to keep SHB populations under control. Beekeepers should be adaptable, adjusting methods based on seasonal risks and local infestation levels.
Other Considerations about Small Hive Beetles
Even with the best management practices, some beekeepers may still struggle with SHB infestations, especially in regions with warm and humid climates. It’s essential to stay vigilant and adjust management strategies based on seasonal risks and local conditions. Additionally, SHB can hitch a ride on package bees or used beekeeping equipment, so be cautious when introducing new bees or gear to your apiary.
Another important factor to consider is integrated pest management (IPM). Instead of relying on a single control method, IPM combines multiple strategies—such as cultural, mechanical, biological, and chemical controls—to effectively manage SHB populations without causing harm to bees or the environment. This approach minimizes reliance on chemical treatments and promotes a balanced, sustainable method for long-term pest management.
Final Thoughts
Small hive beetles are a formidable challenge for beekeepers, but they can be managed effectively with knowledge and proactive measures. Regular hive inspections, strong colony management, and proper apiary hygiene are essential in keeping SHB populations under control. By implementing an integrated approach to prevention and treatment, you can protect your bees from the destructive effects of small hive beetles and ensure a thriving, productive colony.