5 Most Dangerous Insects in Missouri

Missouri is home to a variety of insects, some of which pose risks to humans through painful bites, stings, or the potential transmission of diseases. Understanding these creatures and how to avoid them is essential for staying safe while enjoying the state’s outdoor spaces.

From venomous hornets and aggressive arthropods to disease-carrying pests, these insects thrive in Missouri’s many diverse habitats, from the vast forests of the Ozarks to the urban jungle of St. Louis. Let's explore the most dangerous insects in this Midwestern state, which offers practical tips for minimizing encounters and mitigating risks.

Giant Redheaded Centipede

The giant redheaded centipede is a freaky-looking arthropod found in southern Missouri, particularly in its warm, rocky, or wooded environments. Growing up to eight inches long, it features a bright red head, black body, and yellow legs.

This nocturnal predator preys on insects, small reptiles, and amphibians, using their venomous pincers to immobilize their prey. Although not life-threatening to humans, its bite can cause sharp pain, swelling, redness, and, in some cases, nausea or dizziness.

Human encounters are rare, but the centipede may bite if handled or provoked, so it is best not to do that! To avoid them, be cautious when moving rocks or debris, and wear gloves during outdoor activities.

Mosquito

Mosquitoes are one of the most common and dangerous insects in Missouri due to their role as vectors for deadly diseases such as West Nile virus, Zika virus, yellow fever, and encephalitis.

These small, flying insects are active primarily from spring to fall and thrive in areas with standing water, where they lay their eggs.

Missouri has around 50 different species of mosquitoes, and only female mosquitoes bite, using their needle-like mouthparts to feed on blood, which they need for egg production. Their bites cause itchy, red welts and, in some cases, more severe allergic reactions.

To improve safety, you can put in an effort to reduce mosquito populations. Do this by eliminating standing water in containers, gutters, and other outdoor areas around your home. Use insect repellents containing DEET or picaridin, and wear long sleeves and pants when outdoors, especially at dawn and dusk, when mosquitoes are most active.

Wheel Bug

The wheel bug is a large and distinctive type of assassin bug found in Missouri, known for the spiked, wheel-like structure on its back that kind of resembles a gear. Growing up to 1.5 inches long, it has a gray, armored body and a prominent, curved beak.

Wheel bugs are predatory insects, feeding on caterpillars, beetles, and other pests, making them beneficial in gardens and agricultural areas. However, they can deliver a painful bite to humans when they feel the need to defend themselves. The bite is not venomous but causes localized pain, swelling, and irritation that may persist for several days.

Wheel bugs are solitary and slow-moving, preferring to avoid human interaction. To prevent accidental encounters, avoid handling them, and use caution when in areas where they may be hiding, such as shrubs or tall grass.

Kissing Bug

Kissing bugs are blood-feeding insects found in Missouri that pose a health risk due to their ability to transmit dangerous diseases, including the parasite responsible for Chagas disease. These insects are active at night, feeding on the blood of animals and humans. Although cases of Chagas disease in Missouri are rare, the potential risks make awareness crucial.

They often bite around the mouth or eyes, which has earned them their name. While the bite itself is not harmful, the insects’ feces can carry the dangerous parasites that make this insect so dangerous in Missouri, and scratching the bite site can introduce pathogens into the body.

Kissing bugs are typically found in rural or semi-rural areas of the state, hiding in woodpiles, cracks in walls, or under porches.

European Hornet

These hornets can deliver a painful sting and are more aggressive than typical bees or wasps. Their venom can cause severe allergic reactions, and multiple stings from a group of hornets can even lead to deadly systemic issues. The sting may also lead to swelling, welts, and in some cases, anaphylactic shock.

European hornets prefer to build their nests in hollow trees, attics, or wall voids. While they usually leave humans alone, they become defensive if they feel threatened, especially near their nest.

To avoid their wrath, steer clear of their nests. If you encounter one, don’t try to swat them away like a housefly—they’ll take it personally! Using professional pest control services is often the safest solution to deal with this invasive species in Missouri.

Staying Safe Around Missouri’s Most Dangerous Insects

Awareness of Missouri's most dangerous insects is key to staying safe and comfortable in both urban and rural environments. By recognizing these species and taking precautions such as eliminating potential habitats in your home, using protective clothing, and being cautious outdoors, you can reduce the risks they pose.

While encounters are often rare with most species, understanding how to handle bites or stings ensures you’re prepared wherever you are in the Show-Me state.