Why Yellow Jackets and Hornets Are So Aggressive in Late Summer

They’re uninvited guests at your cookout and weeknight dinners al fresco. They’re in your face when you’re trying to manage your landscape and enjoy time outdoors. What’s with these insects? If you’re wondering, “Why are wasps aggressive?” and “How dangerous are yellow jackets?” we’re here to help. At Cleveland Bee Removal, we hear from folks who notice the uptick in activity in late summer, and whether you call them wasps, hornets, or yellow jackets, we can agree that they’re annoying to deal with. So, what are they up to and why are they so aggressive in late summer? Let’s get into it.

Yellow Jackets vs. Hornets: What's the Difference?

Unsure of the difference between yellow jackets and hornets? You aren’t alone. Lots of folks use these terms interchangeably, even though they are distinct insects. And while both yellow jackets and hornets are social wasps, they differ in size, color, and nesting habits.

Yellow Jackets

The smaller of the two, yellow jackets measure in at only about .5" in length. They’re bright yellow and black striped and often build nests in underground burrows, inside wall voids and crawl spaces, in shrubs and landscape timbers, or under decks and sheds. You’ll often see them scavenging around your property for food.

Hornets

Hornets are much larger than yellow jackets, and can measure up to 1.5” inches in length. They’re often black and white, or brown and yellow, and build exposed, papery nests in trees, bushes, on buildings, or anywhere that is high up and protected from the elements, like roof eaves, in attics, on utility poles.

Both wasps and hornets can sting repeatedly, but yellow jackets are generally more aggressive. They will also attack in large groups and require less provocation than a hornet. That said, simply due to its size and venom load, a hornet sting can be more painful.

Understanding Late-Summer Stinging Insect Activity

As summer transitions into fall, many property owners notice an increase in encounters with yellow jackets and hornets. This isn’t your imagination! These stinging insects often show up at barbecues, picnics, and during yard work, making being outdoors less enjoyable. But knowing why these insects become more active and defensive in late summer can help you to avoid unwanted encounters and recognize when it's time to call a professional hornet exterminator in Cleveland.

Late summer marks a significant change in the life cycle for both yellow jacket and hornet colonies. They have typically reached their largest population of the season, and so workers are actively searching for food. At the same time, many natural food sources begin to decline, and so less pollen, nectar, and insect pests are available. By now, many of the larvae that the queen laid early on have hatched, and so workers can switch from foraging for high-protein food to the high-sugar nectar they crave. Reproductive queens and males also begin to emerge, and so simultaneously there is a greater number of insects competing for a dwindling food supply. And guess where they find it? Our homes, businesses, and property. So as competition for food increases, yellow jackets and hornets are much more likely to interact with people. And that’s where we get to see just how aggressive they can be.

Yellow jackets and hornets are commonly attracted to:

• Outdoor dining
• Sugary drinks
• Fallen fruit
• Barbecue foods
• Pet food
• Garbage cans
• Compost bins

Besides the need for a greater quantity of food, wasps can also take advantage of the warm, long days to stay active longer. They’re able to spend more time gathering food, which could bring them into our paths more often. This level of activity begins to drop the closer we get to winter, when consistently cold temperatures set in.

When Stinging Is Most Likely

Yellow jackets and hornets are territorial and very defensive of their nests–they’re protecting their resources and the next generation. This is a major reason why they become especially defensive when they perceive something you’re doing as a threat to their nest. When this happens, they are typically triggered to sting. 

Common triggers include:

• Lawn mowing
• Hedge trimming
• Tree pruning
• Landscaping projects
• Accidental disturbance while gardening
• Children or pets getting too close

Because yellow jackets and hornets can sting multiple times in a row, nest disturbances–whether done knowingly or unknowingly–are particularly dangerous. Property owners should take note of obvious insect activity. Spotting insects repeatedly entering and exiting the same location may indicate an active nest.

If you have seen yellow jackets and hornets around, you’ll want to take measures to try and reduce any unpleasant encounters. Here’s what to do:

• Keep garbage cans tightly sealed
• Clean up food and drink spills promptly
• Cover food during outdoor gatherings
• Pick up fallen fruit from trees
• Seal openings around your home's exterior
• Inspect sheds, decks, and eaves regularly
• Keep pet food indoors whenever possible

The key to preventing run-ins with these insects is in reducing readily available food sources to make your property less attractive to them. But try as you may, they might still set up shop.

DIY vs Professional Nest Removal

DIY nest removal is a dangerous undertaking that we’d never recommend. Attempting to remove a nest without proper equipment and experience can agitate the colony and trigger defensive swarming, usually resulting in multiple stings. And a larger amount of venom in your system can end up increasing the risk of serious allergic reactions. Going in without a plan or recourse strategy, especially late in the summer season, can just end up making the situation worse. On the other hand, professional hornet exterminators in Cleveland have the training, experience, technique, and protective equipment needed to safely remove nests and neutralize insects.

Late-season nests are not safe to handle without professional help. So if you’re noticing yellow jackets or hornets entering structures or you’ve located an active nest on your property, and especially if the nest is difficult to reach, it’s time to call a wasp exterminator in Cleveland, like the pro team at Cleveland Bee Removal. If family members or staff have allergies to stinging insects, there’s no time to waste–contact us right away to resolve the problem. Early removal can reduce the risk of painful stings and prevent the colony from growing even larger.

In the meantime, you need to protect your family and pets, workforce, clients, and visitors. Keep clear of the area with most insect activity and stay away from any visible nests. And if you or someone else experiences a run-in with the yellow jackets or hornets, and starts to notice symptoms of a severe allergic reaction–e.g., difficulty breathing, swelling of the face or throat, hives, dizziness, or loss of consciousness–seek emergency medical attention immediately.

Your Local Hornet Exterminator In Cleveland

If yellow jackets or hornets have made your home or business their nesting site, don't wait until someone gets stung to have the nest removed. Professional pest control technicians can safely locate and remove active nests while also sharing tips to help reduce the risk of future infestations. Late summer is a particularly active time for yellow jackets and hornets. If you've discovered a nest on your property, professional removal is the safest and most effective solution.

At Cleveland Bee Removal, we’re experts at yellow jacket, hornet, wasp, and bee control in Cleveland. We’ll help you to keep your family and workforce safe if hornets and yellow jackets have claimed your property for their own. Contact our team today to schedule an inspection and reclaim your outdoor spaces before late-summer activity reaches its peak.