Texas is home to a remarkably diverse population of insects and arachnids, from fire ants that cause nearly $100 million in annual agricultural damage to kissing bugs that carry a potentially fatal parasite. Whether you’re dealing with something crawling across your kitchen floor or trying to figure out what just stung you in the yard, here’s what you need to know about the bugs you’re most likely to encounter in the state.
Red Imported Fire Ants
Fire ants are arguably the most universally despised bug in Texas. These aggressive, reddish-brown ants build large dirt mounds in yards, parks, and pastures, and they swarm anything that disturbs the colony. A single encounter can leave you with dozens of stings, each producing a painful, pus-filled blister that takes about a week to heal. A small percentage of people experience severe allergic reactions, including anaphylaxis.
The economic toll is staggering. Fire ants cause an estimated $75 million per year in damage to Texas agricultural areas alone, plus another $16 million in control costs and $5 million in livestock losses. They damage electrical equipment, chew through wiring, and destroy crops. If you see a mound, give it a wide berth. Fire ants don’t give warning before attacking.
Mosquitoes
Texas mosquitoes aren’t just a nuisance. They transmit diseases including West Nile virus, dengue, Zika, chikungunya, and St. Louis encephalitis, some of which can be fatal or cause birth defects. Mosquitoes become infected when they bite an animal, bird, or person carrying a virus, then pass the illness along through subsequent bites. They bite day and night and live both indoors and outdoors, which makes avoiding them a year-round effort in much of the state.
West Nile is the most common mosquito-borne illness in Texas. Most people who are infected don’t develop symptoms, but roughly 1 in 150 infections leads to serious neurological disease. Standing water in your yard, even a bottle cap’s worth, is enough for mosquitoes to breed.
Kissing Bugs and Chagas Disease
Kissing bugs are one of the more alarming insects in Texas, both for their feeding habits and the disease they carry. These inch-long, dark-colored insects feed on blood at night, often biting people around the mouth or eyes while they sleep. Texas has three species, and the state is one of the top three in the country for kissing bug populations alongside New Mexico and Arizona.
About half of the kissing bugs tested in Texas carry the parasite that causes Chagas disease, a serious illness that can damage the heart and digestive system over time if left untreated. The parasite doesn’t enter through the bite itself. Instead, the bug defecates near the wound, and infection happens when a person scratches the feces into the bite or touches their eyes or mouth. Dogs are also at significant risk, often getting infected by eating the bugs. Texas A&M documented 537 cases of canine Chagas disease across 48 counties between 1993 and 2007.
Kissing bugs are attracted to lights at night and can enter homes through cracks around doors and windows. Keeping outdoor lights off, sealing entry points, and checking pet sleeping areas are the best preventive steps.
Lone Star Ticks
The lone star tick, named for the single white dot on the female’s back, is widespread across eastern and central Texas. It’s an aggressive biter that actively pursues hosts rather than waiting on a blade of grass. Beyond transmitting diseases like ehrlichiosis, this tick has gained attention as the primary trigger for alpha-gal syndrome, an allergy to red meat and other mammalian products.
An estimated 450,000 American adults have alpha-gal syndrome, which develops after a lone star tick bite sensitizes the immune system to a sugar molecule found in most mammalian meat. Reactions typically occur three to six hours after eating beef, pork, or lamb and can range from hives to full anaphylaxis. The highest rates are in the southeastern United States, and Texas falls within the lone star tick’s core range.
Asp Caterpillars
The asp caterpillar, also called the puss caterpillar, looks like a small, fuzzy cotton ball clinging to a tree. It’s one of the most venomous caterpillars in North America. Beneath its soft, tan fur lie rows of venomous spines that produce immediate, intense, throbbing pain on contact. The sting has been compared to a broken bone or a burn.
Pain typically peaks within five minutes and subsides within an hour, but other effects can linger. Stings on the arm often cause pain radiating into the armpit. Some people experience headaches, nausea, vomiting, and swollen lymph nodes. In rare cases, stings cause respiratory distress. Asp caterpillars are common on oak and elm trees throughout Texas, particularly in fall. They drop onto cars, outdoor furniture, and unsuspecting people. If you’re stung, applying tape to the area and peeling it off can help remove embedded spines.
Chiggers
Chiggers are nearly invisible mites that live in tall grass, brush, and wooded areas across Texas. They don’t burrow into your skin, despite the popular myth. Instead, the larvae attach to your skin and inject enzymes that dissolve skin cells, which they then feed on. The result is intensely itchy red welts, usually around the ankles, waistband, and anywhere clothing fits snugly against skin.
A hot shower with vigorous scrubbing shortly after outdoor exposure can help dislodge chiggers before they fully attach. Once the itching starts, resist the urge to scratch. Chronic scratching only worsens the irritation and raises the risk of secondary infection.
For prevention, wear long pants and long sleeves in chigger-prone areas. Loose-fitting, tightly woven fabrics work best because they make it harder for chiggers to reach your skin. Applying permethrin to clothing (not directly to skin) provides long-lasting protection that survives several washes. DEET-based repellents applied to exposed skin also help, though they wear off after a few hours and need reapplication. Sulfur powder dusted onto clothing is another old but effective option.
Leaf-Footed Bugs and Garden Pests
If you grow tomatoes in Texas, you’ve probably met leaf-footed bugs. These dark brown insects, about three-quarters of an inch long, are named for the flat, leaf-shaped extensions on their hind legs. Adults have a distinctive white or yellowish stripe across the back. The immature nymphs look completely different: smaller, with bright red or orange and black bodies, often clustered together on plants and moving in a spider-like pattern.
Leaf-footed bugs use sharp, piercing mouthparts to suck juices from fruit, leaving behind yellow, bleached marks with hardened skin or rotten spots. They feed on tomatoes, cucumbers, prickly pear cactus, and a wide range of other garden plants. They also emit a foul odor when handled. While they’re not dangerous to people, they can ruin a garden harvest quickly if left unchecked.
Scorpions
The striped bark scorpion is the most common scorpion in Texas and the one you’re most likely to find inside your home. They’re small, pale yellow to tan, with two dark stripes running down the back. They hide in shoes, closets, attics, and stacks of firewood during the day, then emerge to hunt at night.
A sting from a striped bark scorpion feels like a sharp, burning jab. For most adults, the pain is comparable to a wasp sting and resolves within a few hours. Numbness or tingling around the sting site is common. Children and the elderly are more vulnerable to stronger reactions. Shaking out shoes and gloves before putting them on is the simplest way to avoid an unpleasant surprise, especially if you live in central or west Texas where scorpions are most abundant.
Protecting Yourself Outdoors
Texas bugs are active nearly year-round thanks to the state’s warm climate. A few habits go a long way. When spending time in brush or tall grass, wear long pants tucked into socks and apply DEET to exposed skin. Treat clothing with permethrin before trips into tick or chigger habitat. Keep outdoor lights off at night to avoid attracting kissing bugs, beetles, and other nocturnal insects to your doors and windows.
At home, seal gaps around doors, windows, and utility pipes. Remove standing water from your property to cut mosquito breeding sites. Keep firewood stacked away from the house, and inspect it before bringing it inside. For fire ants, treat mounds with bait products in early morning or late evening when ants are actively foraging. Most of these bugs are manageable once you know what you’re dealing with and where they’re likely to show up.