Wheel bugs are fascinating insects known for their unique appearance and beneficial role in the ecosystem. These large, distinctive-looking bugs get their name from the cog-like toothed wheel on their thorax, a structure unique to their species in Illinois and the U.S. source. They play a crucial role in controlling pest populations, as they are predators that feed on other insects.
While wheel bugs are considered beneficial to have around, they are also known for their painful bite. It’s crucial to handle these bugs with caution, as their bites can be more severe than a bee sting source. In fact, a wheel bug bite has been described as much more powerful than a hornet or wasp sting, taking about 10 days to heal and leaving a small scar source.
Understanding Wheel Bugs
Appearance
Wheel bugs (Arilus cristatus) are distinctive insects known for their unique, cog-like structure on their thorax. They can be quite large, measuring between 1 to 1-1/2 inches long, with a light gray to grayish-brown color. The most notable feature is the “wheel,” which has 8-12 teeth or tubercles 1. These insects have thin, rusty brown antennae and front legs adapted for capturing prey 2.
Distribution and Habitat
These insects are widely distributed and can be found throughout the United States 3. They are commonly found in various habitats, such as forests, gardens, and fields, where they prey on other insects, including ants, beetles, and aphids 4.
Lifecycle
The lifecycle of a wheel bug consists of several stages, from eggs to nymphs, and finally, adults. Female wheel bugs lay clusters of eggs, which eventually hatch and release nymphs 5.
Nymphs undergo several instar stages, progressively growing larger and developing their characteristic “wheel.” They change color during this process, initially appearing red and transitioning to a cryptic gray 6.
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Wheel Bug Bites
Why Wheel Bugs Bite
Wheel bugs, or Arilus cristatus, are a type of assassin bug that prey on pest insects to feed themselves. Though helpful for controlling pests, they tend to bite humans when they feel threatened or are mishandled. A wheel bug bite can be more painful than a hornet or wasp sting. It’s important to treat their bites with caution, especially when dealing with children.
Symptoms
Some common symptoms of a wheel bug bite include:
- Painful sensation at the site of the bite
- Redness and swelling
- Itching and irritation
- Hives or welts
In some cases, individuals who are allergic to insect bites and stings might experience anaphylactic shock. This could be a life-threatening situation and requires immediate medical attention.
Treatment
When bitten by a wheel bug, consider the following treatment options:
- Wash the wound: Clean the area with soap and water to reduce the risk of infection.
- Apply a cold compress: This helps to minimize swelling and pain.
- Use a topical cream: Apply a hydrocortisone or antihistamine cream to alleviate itching and inflammation.
If the symptoms worsen or an allergic reaction occurs, seek immediate medical help.
An overview of wheel bug bites:
| Aspect | Wheel Bug Bite |
|---|---|
| Cause | Threatened or mishandled wheel bugs |
| Pain level | More painful than a wasp or hornet sting |
| Symptoms | Pain, redness, itching, swelling, hives |
| Treatment | Washing, cold compress, topical cream |
Remember to handle wheel bugs carefully to avoid getting bitten, and seek medical help if the symptoms worsen or an allergic reaction occurs.
Wheel Bugs and Your Home
Indoor Infestations
Wheel bugs (Arilus cristatus) are members of the Reduviidae family, known as assassin bugs. They are beneficial insects that prey on other pests like flies. However, these bugs can occasionally venture indoors and infest homes, especially in areas like Florida, where they are more prevalent. Despite being helpful for controlling pests, wheel bugs can deliver a painful bite, making them unwanted visitors in residential spaces.
When found indoors, it’s essential to address wheel bug infestations with caution, as their bites can be more severe than a bee sting. Proper pest control and preventative measures can help reduce the risk of an infestation.
Prevention Measures
To prevent wheel bugs from entering your home, consider implementing the following strategies:
- Seal Cracks and Gaps: Check for cracks and gaps around doors and windows. Seal them using caulk or weatherstripping to deter these pests from coming in.
- Install Screens: Ensure all windows and doors have well-fitted screens to keep out wheel bugs and other insects.
The table below gives a brief comparison of two prevention methods:
| Method | Pros | Cons |
|---|---|---|
| Sealing gaps | Effective in keeping insects out | Can be time-consuming |
| Installing screens | Allows airflow while blocking bugs | May require professional installation |
Addressing wheel bug infestations often requires a balanced approach, as they are beneficial insects. Limiting the use of insecticides and pesticides can help maintain their positive impact on controlling other pests while taking proactive steps to keep them out of your home.
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Ecological Role and Benefits
Predatory Behavior
Wheel bugs, also known as assassin bugs, are beneficial insects that serve as predators in the garden. They are known for hunting various arthropods, especially soft-bodied insects such as caterpillars and moths. With their piercing, sucking mouthparts, they easily catch and consume their prey. It’s important to understand their predatory behavior, as this knowledge can assist in utilizing them as beneficial insects for garden pest management.
Examples of wheel bug prey:
- Caterpillars
- Moths
- Soft-bodied insects
Benefits to Gardens
Wheel bugs are valuable predators in gardens due to their appetite for many common pests, such as stink bugs and bees. Specifically, they have been known to prey on the brown marmorated stink bug, which has been an increasingly persistent problem for gardeners. Additionally, these true bugs can help keep populations of unwanted insects in check, promoting an overall healthier environment for your plants.
Key benefits of wheel bugs in gardens:
- Prey on a variety of pests
- Help control stink bug populations
- Support healthy plant growth
Comparison table: Wheel Bugs vs. Brown Marmorated Stink Bugs
| Feature | Wheel Bugs (Assassin Bug) | Brown Marmorated Stink Bugs |
|---|---|---|
| Size | Gray, 1.0 – 1.25 inches long | Brown, 0.5 – 0.6 inches long |
| Appearance | Red and black, with a distinctive cogwheel-like structure on their back | Brown, marmorated color pattern, with a shield-shaped body |
| Harmful to Garden | No, they are beneficial predators | Yes, they feed on plants and can cause damage |
| Overwintering | Yes, they can overwinter as adults | Yes, they can overwinter as adults |
| Pest Management Role | Beneficial predator, helps to control pest populations | Pest, can cause plant damage and requires management |
By understanding the ecological role and benefits of wheel bugs, gardeners can harness their predatory behavior to maintain a healthy and thriving garden ecosystem. Their presence has positive effects, such as the reduction of stink bug populations and damage to plants. Remember to appreciate the wheel bugs in your garden and the important contributions they make!
Assassin Bug Family and Related Insects
Assassin Bug Family
The Assassin Bug family, also known as Reduviidae, is a group of insects that are primarily predators of other insects. One of the most well-known members of this family is the wheel bug (Arilus cristatus). Wheel bugs are large, distinctive-looking insects with a prominent cog-like toothed wheel on their thorax. These insects are important predators of forest insects and provide valuable pest control services in gardens and yards.
Examples of other insects in the Reduviidae family include:
- Kissing bugs
- Masked hunters
Kissing bugs are known for transmitting Chagas disease, which can be harmful to humans. On the other hand, masked hunters prey on household pests like bed bugs and cockroaches.
Other Insects in the Hemiptera Order
The Hemiptera order encompasses a wide variety of insects, including wheel bugs and other assassin bugs. This order is composed of over 80,000 species of insects, with some being wingless while others having wings. Examples of insects within the Hemiptera order are:
- Aphids
- Leafhoppers
- Scale insects
- Stink bugs
These insects are characterized by their piercing and sucking mouthparts, which allows them to feed on plant sap, other insects, or even vertebrates like birds and reptiles.
| Wheel Bug | Aphid | |
|---|---|---|
| Appearance | Gray, cog-like wheel on thorax | Tiny, pear-shaped body |
| Feeding Habits | Predatory | Plant sap |
| Role in Ecosystem | Pest control | Plant pests |
When dealing with pest insects in the Hemiptera order, using insecticides can be effective. However, it’s important to remember that beneficial insects like wheel bugs and other assassin bugs can also be affected by these treatments. Therefore, it’s crucial to ensure that pest control methods do not harm beneficial insect populations.
Footnotes
26 Comments. Leave new
I can personally vouch for this critter’s natural armament, having been shanked by them not once, but twice. DO NOT pick one up with an unprotected hand unless you enjoy the sensation of having a miniscule, live fire-coal buried in your skin for 30 seconds, and of the embers smoldering there for an hour or so afterwards.
The worst of the pain may not last long, but it was more than enough to make me forget everything else around me for that first 30 seconds.
If you’re wondering why I picked up a Wheel Bug twice, well, I didn’t. The first time was childish (and ignorant) curiosity; the second was poor lighting and poor choice of hand placement in propping myself against a brick wall…
True story, the first time I saw one of these it was running at me very aggressively while I was sitting on the sidewalk in front of my work. I poked at it with a pencil (which makes most bugs run off the other way) but the thing reared up and charged me again! I decided to let him have the sidewalk!
I found and took a picture of a wheel bug, in western Pennsylvania on about the same day…I am not sure how to post pictures, but, I am just wondering, did they all have a convention of sorts, because I had never seen on before in my lifetime.
The green eyes fascinated me! So happy to find it to be bug of the month…they must have decided they were due some recognition!
http://www.flickr.com/photos/pixelsprose/5203186706/
Wheel bug nymph, indeed!
Haven’t seen the spiraling white fly or the pink mealy bug,real bad news here in Fl.
The first time I saw a wheel bug, I had no idea what it was and was tempted to touch its back. Very glad I enjoyed him from afar!
I was bitten by this Wheel Bug Today…. And it hurt harder than a bee sting but did go away faster than a sting bee bite!! I was freaked out at first cause I wasn’t sure if the bite was venomous or not! Luckily it’s not!! The spot I was bitten at is still tender to the touch but no biggie. I wouldn’t want my little ones nor any little children for that matter to ever get bitten by this Wheel bugs, because it will hurt them and make them cry!! I screamed when it bit me!! Hope this explanation helps someone looking for info on this bug like I was!! Thanks for you alls info it help me!! 😉
Thanks for supplying a first hand report of what we have frequently stated on our site. The Wheel Bug should be handled with caution, as it might bite, and the bite may be painful, but the effects do not last and there is no permanent damage to the person bitten.
I found one too. …
Though they might not be dangerous for humans, but can be harmful. A bug bite can result into many things. It’s better to stay safe rather take chances.
I have so many of them in my house an really not sure why i have no plants
Are you certain you don’t have a different species? We would suspect Brown Marmorated Stink Bugs or Western Conifer Seed Bugs.
I can’t believe the hospital couldn’t figure out what the bug is! As much as I love bugs, I would probably freak out if one got down my pants, lol!
http://www.whatsthatbug.com/2014/10/12/wheel-bug-bites-husband-home/
Found one crawling on side of my garage in fort wayne indiana, they are really ugly and scary looking….creepy!!
I have a good picture and don’t think it’s a wheel bug. Please, I need information whether to kill it or not.
Insetologia also has a Wheel Bug bite story, Marquinhos said it was excruciating. It was an incorrect handling: http://www.insetologia.com.br/2013/04/bolsa-de-cheiro-e-picada-do-percevejo.html
It did not happen in Feb. It happen labour day weekend. Early September.
I remember that it was very painful, but also that my hand swelled instantly.
we left immediately, think I might have to go to ER. But before we got to Indianapolis, the swelling had gone down and it wasn’t stinging anymore. I survived 🙂
Thanks for confirming our suspicions.
It did not happen in Feb. It happen labour day weekend. Early September.
I remember that it was very painful, but also that my hand swelled instantly.
we left immediately, think I might have to go to ER. But before we got to Indianapolis, the swelling had gone down and it wasn’t stinging anymore. I survived 🙂
I found one in my house. My dog was almost laying on it, I thought my dog had actually brought in a stick and chewed it up, that’s how big it was. It must have been 3 inches long and the back of it was shaped just like a giant stink bug. I picked it up with my hand at first because as I said it looked like a chewed up stick at first, but when it moved in my hand I dropped it quickly and saw that the bottom of it had a red stinger like thingy on its but, do the bite or sting humans?
Wheel bugs cannot sting. They might bite if carelessly handled.
I just took a picture of one here at the Walmart in Lexington north Carolina
Hi we found a few on our deck that appeared to be the same bug. We were not sure what they were and kept one in a baggie. The larger one evidently flew away. They looked just like the photo here and we did let the small one go. They’re just intimidating and definitely don’t want to be stung by one. Thanks for clarifying what it is.
Found one of these on my screen room. Was worried about my nosie dogs getting bit or stung. So don’t worry?