Yes, yellow jackets can kill honey bees, but the relationship is more complicated than a simple wasp-versus-bee war. Yellow jackets are opportunistic predators and scavengers. They may catch individual bees, feed on dead bees around an apiary, take brood and honey, and in heavy late-season pressure can overwhelm a weak colony.
TL;DR: A strong honey bee colony can usually defend itself against normal yellow jacket pressure. Weak colonies, large entrances, spilled syrup, exposed comb and robbing activity make the situation worse. Your best defenses are good colony health, a smaller defensible entrance, a robbing screen where needed, a tidy apiary and safe, locally appropriate control if a nearby yellow jacket nest is creating serious pressure.
What Is a Yellow Jacket?
Yellow jackets are social wasps, mainly in the genera Vespula and Dolichovespula. The name is used mostly in North America, and it covers a number of species rather than one single insect. Many are black and yellow, live in colonies and are important predators of other insects.
Adult yellow jackets use sugary foods such as nectar, fruit juices and other carbohydrates for energy. They also collect animal protein for developing larvae, which is where the conflict with bees starts. A honey bee colony represents an unusually concentrated little supermarket containing adult insects, brood and carbohydrates.
Do Yellow Jackets Kill Honey Bees?
They can. Yellow jackets have been observed attacking honey bees, especially isolated, weakened or vulnerable individuals around an apiary. They will also scavenge dead bees, and research on the German yellow jacket, Vespula germanica, found that scavenging bee carcasses can be an important part of its feeding behaviour around hives.
That is worth separating from the idea that every yellow jacket arriving at an apiary is a specialist bee hunter. In one study of V. germanica and Italian honey bees, direct attacks at guarded hive entrances were relatively uncommon and had a low success rate. The wasps more often targeted isolated or weakened bees near the hive. Honey bees can also recruit nestmates and drive an attacking wasp away.
Things change when the bee colony is weak or yellow jacket pressure is high. A vulnerable hive may not have enough guards to defend its entrance, and yellow jackets can then move from picking off individuals to taking brood and food from inside the colony. This is where they can become a serious beekeeping problem.
If you are still learning how colony strength and normal hive activity should look, this guide to what a honey bee hive looks like is useful background.
The Yellow Jacket Life Cycle
Most temperate yellow jacket colonies are annual. A mated queen survives the cold season in a protected place, emerges in spring and begins a small paper nest. She raises the first workers, and those workers then take over much of the foraging while the queen concentrates on laying eggs.
As the season progresses, the worker population can become large. The colony needs both carbohydrates for adult energy and animal protein for developing larvae, so workers forage widely for nectar, fruit, insects, carrion and human food. Anyone who has watched yellow jackets hijack a soft-drink can at a picnic already knows how determined that carbohydrate search can become.
In colder regions, the worker colony normally dies as winter approaches while newly mated queens seek protected places to overwinter. Local climate and species matter, however, so the timing and colony size can vary considerably.
Why Yellow Jacket Pressure Often Increases Late in the Season
Late summer and autumn are often when beekeepers notice the most trouble. Yellow jacket colonies may be near their seasonal population peak while nectar flows are declining and bee colonies may have fewer easy outside food sources. Weak hives therefore become increasingly attractive concentrations of protein and sugar.
This is also the time when honey bee robbing can begin. Once bees are fighting around an entrance and dead bees or spilled honey accumulate, the apiary becomes more attractive to other scavengers and predators. In my personal experience, robber bees can cause more damage than yellow jackets: a robbing frenzy can produce handfuls of dead bees and open the door to yellow jackets, ants and other pests.
Native and Introduced Yellow Jackets
Species and location matter. The German yellow jacket, Vespula germanica, is native to Europe, northern Africa and temperate parts of Asia and has become established in a number of regions outside that native range, including parts of North America. The western yellow jacket, Vespula pensylvanica, by contrast, is native to western North America but is invasive in places such as Hawaii.
That is why I would not use a simple rule that says “native good, invasive bad” and then start destroying nests. Native yellow jackets can provide useful insect-predation services, while introduced species can have serious ecological impacts in some places. Before controlling a nest, identify the species if possible and consider local guidance, actual risk to your hives and whether the nest is creating a human-safety problem.
How Yellow Jackets Attack a Beehive
There are several levels of interaction. At the mild end, an individual yellow jacket may scavenge a dead bee or catch an exposed worker. At the next level, repeated wasps patrol around the entrance looking for vulnerable bees and opportunities to slip inside.
A serious attack looks different. Numerous yellow jackets may concentrate at a weak hive, test the entrance repeatedly and enter to take brood or stored food. If the bee colony cannot maintain an effective guard force, the pressure can compound quickly.
This is one reason a small entrance can make such a difference. A weak colony trying to guard a wide opening is like asking two security guards to protect an airport runway. Reduce the opening and the same number of guard bees can concentrate on a much smaller front.
How to Protect Honey Bees From Yellow Jackets
Keep the Bee Colony Strong
This is the most important defence. Yellow jackets are opportunists, so a healthy colony with plenty of guards is much harder to exploit than a small colony weakened by mites, disease, starvation or queen problems. Good beginner beekeeping fundamentals therefore do more for yellow jacket control than many gadgets.
Check vulnerable colonies rather than assuming yellow jackets are the original cause of every problem. Sometimes the wasps are simply showing you where a colony was already failing. Correcting the underlying weakness is more useful than endlessly killing individual wasps outside the entrance.
Reduce the Entrance
Towards the end of the honey season, a weak colony may not be able to field enough guards to protect a large entrance. An entrance reducer decreases the area those bees have to defend. Oregon State University Extension specifically recommends reducing the entrance of a colony under attack and notes that a robbing screen can further deter yellow jackets.
Do not ignore ventilation in hot weather. If the entrance needs to be restricted heavily during high temperatures, use a setup that still allows adequate airflow.
Use a Robbing Screen
A robbing screen changes the route resident bees use to enter and leave while making the obvious entrance less useful to intruders. Honey bees from the colony learn the altered route; yellow jackets and robber bees repeatedly attracted to the entrance odour are more likely to be frustrated by the screen.
This is especially useful when yellow jacket pressure and honey bee robbing are happening together. The important point is to install it before the colony is completely overwhelmed rather than waiting until the front of the hive is already chaos.
Keep the Apiary Clean
Do not leave burr comb, exposed honey, dead brood, protein feed or spilled syrup lying around the apiary. These are invitations to scavengers. Feed carefully, clean spills and avoid leaving open comb exposed longer than necessary.
This sounds boring compared with attacking wasp nests, but boring management often works better. If you stop advertising free protein and sugar, you reduce one of the reasons yellow jackets keep returning.
Use Traps as a Supporting Measure
Commercial traps can catch yellow jackets and reduce the number of foragers in a local area, but they are not a magic force field around a hive. Lures vary in effectiveness between yellow jacket species; the USDA notes that an attractant effective for the western yellow jacket is ineffective for some eastern Vespula species.
If you use traps, choose one intended for the species or pest group in your area and place it according to its directions. Think of trapping as one part of an integrated plan alongside strong colonies, reduced entrances, screens and sanitation rather than the only line of defence.
Nest Control and Professional Removal
If a nearby nest is creating severe pressure or a sting hazard, control may be justified. Ground and structural nests can be dangerous to approach because a disturbed colony can release many defensive workers very quickly. I would use a licensed pest professional for difficult nests, especially those in buildings, high-traffic areas or locations where safe access is poor.
If a pesticide is used, use only a product currently registered for yellow jackets in your jurisdiction and follow the current label exactly. Keep treatments and baits away from honey bees and other non-target animals, and pay close attention to label instructions on placement, children, pets, wildlife and disposal. Registrations change, so an old web page naming one product is not a reliable substitute for the current label.
And one thing from the old version of this article deserves retirement: pouring molten metal into a ground nest may make dramatic internet viewing, but it is not sensible apiary management. Fire, severe burns and environmental damage are a poor trade for a wasp problem.
When Yellow Jackets Are a Warning Sign
A few yellow jackets around an apiary do not automatically mean you have a crisis. What worries me is persistent pressure on one colony, repeated entry through the hive entrance, bees fighting at the landing board, yellow jackets carrying resources away, or a colony that simply cannot maintain normal defence.
That should prompt two investigations at once: deal with the yellow jacket pressure and work out why that particular colony is vulnerable. Check colony population, queen status, food, pests and disease. A strong hive can normally defend itself much better, and the appearance of yellow jackets may be the symptom that draws your attention to a deeper management issue.
Honey bees themselves are wonderfully adapted to reading movement around the entrance, helped by sophisticated vision; if that side of bee biology interests you, see Do Bees Have Compound Eyes?
Frequently Asked Questions
Can yellow jackets destroy a honey bee hive?
Yes, heavy yellow jacket pressure can contribute to the collapse of a weak colony by killing bees and taking brood or stored food. Strong colonies usually defend themselves much better, so serious attacks are also a reason to check the hive for other problems such as low population, mites, disease, hunger or queen issues.
Why are yellow jackets attacking my bees?
A beehive concentrates resources that yellow jackets can use: adult insects and brood provide protein, while honey and syrup provide carbohydrates. Pressure often becomes more noticeable later in the season when yellow jacket populations are large and other food sources may be declining.
Do entrance reducers help stop yellow jackets?
Yes. Reducing a hive entrance gives a smaller number of guard bees less space to defend. Robbing screens can provide additional protection by changing the route resident bees use while making direct entry more difficult for yellow jackets and robber bees.
Should I kill every yellow jacket nest near my hives?
No. Yellow jacket species differ in ecological role and native status, and a nest that is not threatening people or colonies may not require control. If a nest is causing severe apiary pressure or a sting hazard, identify it if possible and use locally appropriate control or professional removal rather than treating every nest automatically.
If you are dealing with a different bee species rather than yellow jackets, this related guide explains How to Get Rid of Bumblebees Without Killing Them.
Dr Garth A. Cambray is a beekeeper, biotechnologist and researcher with nearly three decades of practical beekeeping experience. He holds a PhD in Biotechnology from Rhodes University and has worked extensively in honey production, fermentation biotechnology and value-added bee products. View Dr. Garth Cambray’s credentials, research and experience.
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