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Which roaches are getting into my Weslaco home?
It depends on the size and where you see them. In Weslaco, small light-brown roaches that fly toward your porch lights and windows at dusk may be Asian cockroaches, which researchers first identified in large numbers in Weslaco lawns in the winter of 2005-2006 (Pfannenstiel et al., Annals of the Entomological Society of America, 2008). Small roaches that live in your kitchen cabinets and don’t fly are German cockroaches. Big reddish-brown roaches from drains and the yard are American cockroaches, the “palmetto bugs.” Each one is handled differently, so the first step is knowing which one you have.
Seeing roaches in your Weslaco home or business? Call or text Chris at (956) 287-2118 for a free roach inspection. Hablamos español.
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Why does Weslaco have so many roaches?
- Weslaco is where the Asian cockroach turned up in the Valley. Scientists at the USDA Agricultural Research Service’s Beneficial Insects Research Unit in Weslaco found large numbers of a cockroach that looked like the German cockroach in home turf settings in Weslaco in the winter of 2005-2006, about 11 km from the border, and confirmed it was the Asian cockroach (Pfannenstiel et al., 2008). By summer 2006 they were counting up to 100 or more per square meter in soybean fields at Weslaco (USDA ARS, Jan. 15, 2008).
- A farm town at heart. Weslaco takes its name from the W. E. Stewart Land Company, which bought 30,000 acres in 1917, and the townsite was platted in 1919. Texas A&M’s Valley Experiment Station opened there in 1923 (Texas State Historical Association, Handbook of Texas, Weslaco). Fields, lawns, mulch beds and leaf litter are the outdoor homes of Asian, American and smokybrown roaches.
- A growing city with a mix of older and newer homes. Weslaco has about 42,200 residents and 17,400 homes. The median home was built in 1995, and about 11% were built before 1970 (U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates, via Census Reporter). Older homes tend to have worn door sweeps and gaps around pipes.
- Wet weather pushes roaches in. Texas A&M AgriLife says American, oriental and smokybrown roaches live mostly outdoors but may move indoors in search of food or water (AgriLife, Cockroach Biology and Management, 2017).
How can I tell German, Asian and American roaches apart?
| Asian cockroach | German cockroach | American cockroach (“palmetto bug”) | |
|---|---|---|---|
| Size | Small, looks almost identical to German | 1/2 to 5/8 inch | 1 1/2 to 2 inches, the largest in Texas |
| Flies? | Yes, a strong flier | Has wings but doesn’t fly | Both adults can fly |
| Lives | Outdoors in leaf litter, mulch and grass | Indoors only in Texas | Mostly outdoors: sewers, drains, mulch, palm fronds, water meters |
| When you see it | At dusk, flying to lights, windows and light-colored walls | In kitchens and bathrooms; daytime sightings mean a lot of them | At night, often after rain or from drains |
| What works | Treating the yard where they live | Targeted indoor baits and crack-and-crevice work | Sealing entry points and treating outside and in |
Sources: Texas A&M Urban and Structural Entomology, Asian Cockroach; AgriLife, 2017.
Texas A&M’s urban entomology program says the Asian and German cockroach are so alike that even experts have trouble telling a dead one apart. Behavior is the giveaway: Asian roaches fly in from outside toward light, and German roaches stay hidden indoors.
Why do small roaches fly at my lights at night?
That’s the classic Asian cockroach habit. Texas A&M says that at dusk, adult Asian cockroaches become very active and are attracted to light reflected off light-colored walls, doorways and windows. They try to get inside and rest on lighted surfaces like lamp shades and TV screens, and when you turn off a light and leave the room, they may follow you to the next lighted room (Texas A&M Urban Entomology).
The important part: Texas A&M says that because only a few Asian cockroaches enter a house at night, indoor treatments alone have been completely ineffective against them. The fix is outside, in the leaf litter, mulch and grass where they live.
What are the signs of German roaches in my kitchen?
German roaches are the bigger problem, because they breed indoors. AgriLife says they can produce a generation in about 100 days and spend about 75% of their lives hidden in cracks 1/32 to 3/16 inch wide (AgriLife, 2017). Watch for:
- Roaches in the daytime. AgriLife says that usually means there are a lot of them.
- Small roaches in cabinets, around the fridge, stove, dishwasher and microwave.
- Droppings that look like crushed pepper in drawers, cabinet corners and hinges.
- Egg cases, small brown bean-shaped capsules, in cracks and behind appliances.
Free inspection. Not sure which roach you have? Chris will check your kitchen, bathrooms, drains, doors, garage, lights and the outside of your home, show you what he finds, and give you a price before any work starts. Book your free inspection or call or text (956) 287-2118.
How do roaches get into a Weslaco house?
AgriLife says the larger roaches often come in through poorly sealed doors, roof soffits and floor drains, and that roaches can also ride in with groceries or boxes. The spots we check:
- Gaps under exterior doors, patio doors and garage doors
- Floor drains and dry drain traps in rooms nobody uses
- Holes where plumbing, A/C lines and cables go through the wall
- Soffits and eaves, especially near palm fronds or trees
- Mulch, leaves and plants piled against the foundation
How does CPL handle roach control in Weslaco?
CPL Pest Control LLC follows the integrated approach Texas A&M recommends: inspection, sanitation, exclusion and targeted treatment.
- Free inspection. We figure out which roach you have and where it’s living and getting in, inside and out.
- Indoor treatment for German roaches. Baits and crack-and-crevice treatment where they hide, not just where you see them.
- Outdoor treatment for Asian and American roaches. We treat the yard, mulch beds, leaf litter and entry points, since that’s where these roaches live.
- Fixes and follow-up. We show you which gaps, drains and moisture spots to fix, and we come back as needed.
We also service restaurants, offices and warehouses in Weslaco. Learn more on our German roach treatment page.
Our guarantee: 30-day guarantee if you are not completely happy with our service. No contracts.
What can I do now to keep roaches out?
These steps come from Texas A&M guidance:
- Rake up leaf litter and thin out mulch next to the house, where Asian and smokybrown roaches hide.
- Switch porch and carport lights off when you don’t need them, or keep doors closed at dusk when Asian roaches fly to lights.
- Pour water into unused drains so the drain trap stays full and blocks the sewer line.
- Fix leaks under sinks, at the water heater and at outdoor faucets.
- Check the threshold seals under doors and make sure soffits are screened.
- Don’t leave pet food or dirty dishes out overnight, and keep trash closed.
Frequently asked questions about roaches in Weslaco
Are the flying roaches at my porch light German roaches?
Probably not. German roaches don’t fly. Small roaches flying to lights at dusk are more likely Asian cockroaches, which were confirmed in Weslaco in 2006. A free inspection will tell you which one you have.
Why didn’t the bug spray work?
Texas A&M says indoor treatments alone have been completely ineffective against Asian cockroaches, because they live outside and only a few come in each night. For German roaches, AgriLife says sprays are not nearly as effective as baits.
Is a palmetto bug the same as a roach?
Yes. AgriLife says “waterbug” and “palmetto bug” are common names for the American cockroach.
¿Hablan español?
Sí. Llame o envíe un mensaje de texto a Chris al (956) 287-2118. También puede leer nuestra página de control de plagas en Weslaco.
Do you answer after hours?
Yes. Our Rio Grande Valley line answers 24/7 at (956) 287-2118.
Ready to get the roaches out of your Weslaco home?
Whether they’re flying to your lights or hiding in your kitchen, the right treatment depends on the roach. Call, text or book online, and Chris will inspect your home and give you a price before any work starts.
Call (956) 287-2118 | Text Chris | Book a free inspection
Related reading and services:
- Pest control in Weslaco, TX
- Pest control in the Rio Grande Valley
- Roaches in Pharr homes: why rain brings them inside
- German roach treatment
- Contact CPL Pest Control
About the author: Christopher Villarreal owns CPL Pest Control LLC (Texas TPCL license 0567655) and has over 20 years of experience in pest control. CPL Pest Control LLC is licensed and insured and serves Weslaco and the Rio Grande Valley.
Published November 13, 2026.
