Texas is home to several weevil species that affect everything from kitchen pantries to cotton fields to ornamental palm trees. The most common ones you’ll encounter fall into three categories: stored-grain weevils that infest food in your home, the historically devastating boll weevil that targeted cotton, and newer invasive species threatening landscape palms. Here’s what you need to know about each one and how to deal with them.
Stored-Grain Weevils in Your Pantry
The weevils most Texans encounter firsthand are rice weevils and granary weevils, both of which infest dry foods stored in kitchens and pantries. Rice weevils are by far the more common household pest in Texas. They’re about 1/8 inch long, dull reddish-brown, and have four faint yellowish marks on their wing covers. They can fly and are attracted to light, which is why you might spot them near windows or light fixtures far from your food storage. Granary weevils look similar but are slightly larger (up to 1/4 inch), darker in color, and lack those pale spots. They can’t fly, so they tend to stay closer to their food source.
A third related species, the maize weevil, also shows up in Texas stored products. All three belong to the same family and behave similarly.
These weevils don’t just eat rice. They attack corn, wheat, beans, nuts, cereals, flour, pasta, dried fruit, and even spices like paprika and chili powder. Rice weevils will also feed on apples and pears. The real problem is how they reproduce: a female chews a tiny hole into a grain kernel, deposits a single egg inside, then seals the hole with a gel-like substance. The egg, larva, and pupa all develop hidden inside that kernel, completely out of sight. The larvae are legless, creamy-white grubs with dark heads. You won’t see them until the adult chews its way out.
How Fast Weevils Multiply
A single female lays between 30 and 250 eggs over her lifetime, and adults live seven to eight months. In warm Texas summers, the full lifecycle from egg to adult takes roughly five weeks. In cooler conditions, it can stretch to 20 weeks. That summer timeline is what makes infestations explosive: researchers estimate one breeding pair can produce up to 6,000 offspring in a single year. By the time you notice a few adults crawling around your pantry, thousands of eggs and larvae may already be developing inside your stored grains.
Getting Rid of a Pantry Infestation
Start by inspecting every dry food item in your pantry, not just the obvious grains. Check flour, cereal, pasta, nuts, dried fruit, and spices. Don’t skip unopened containers, because these weevils are small enough to crawl under loose-fitting lids. If you find infested food, throw it away immediately.
For items you want to save, you have two options. Heating food in the oven at 130°F for 30 minutes kills all life stages. Alternatively, placing food in a freezer at 0°F for four days does the same thing. Freezing is the better choice for flour, spices, and other items that don’t do well with heat.
After clearing the infestation, store all dry goods in glass jars with rubber gasket seals, sturdy plastic containers, or metal canisters with tight-fitting lids. Standard cardboard boxes and paper bags offer no protection. When buying bulk grains or dried fruit, inspect the product carefully before bringing it home. Many infestations start at the store, not in your kitchen.
The Boll Weevil and Texas Cotton
No discussion of Texas weevils is complete without the boll weevil, which devastated the state’s cotton industry for most of the 20th century. This small beetle feeds on cotton bolls, destroying the fiber inside before it can be harvested. At its peak, the boll weevil caused billions of dollars in losses across the American South.
Texas created the Boll Weevil Eradication Foundation in 1993 as a grower-funded effort to eliminate the pest. The Foundation divided the state into 16 eradication zones covering nearly six million cotton acres, with 56 offices and staff who map cotton fields, set monitoring traps, and coordinate aerial pesticide applications in infested areas. The results have been dramatic: since the program began, boll weevil populations across Texas have been reduced by more than 99 percent. All active cotton-growing areas in the state participate in ongoing monitoring to prevent a resurgence.
South American Palm Weevil
A newer concern for Texas is the South American palm weevil, a large beetle that attacks palm trees. It was detected in Alamo, Texas (in the Rio Grande Valley) in 2012, though as of the most recent assessments, no established breeding populations or palm deaths from this weevil have been confirmed in the state.
That’s good news, but the threat is real. In its native and invaded ranges, this weevil is a serious palm killer. Larvae feed on the soft growing tissue at the very top of the palm, called the palm heart, which is responsible for producing new fronds. Heavy infestations destroy this tissue, causing the crown to tilt, collapse, and die. Palms in advanced stages of attack develop a distinctive flattened top, and as the remaining fronds dry out, the tree looks like a giant brown umbrella. The weevil attacks coconut palms, date palms, Canary Islands date palms, and several other species. Adults also feed on ripe fruit from non-palm trees including avocados, mangoes, bananas, citrus, and papayas.
For Texans with ornamental palms, especially in South Texas, keeping an eye on crown health is the best early warning. A palm whose newest fronds are wilting, breaking, or collapsing inward could be under attack.
Telling Weevils Apart From Other Pantry Bugs
Weevils are easy to distinguish from other common pantry pests like Indian meal moths or flour beetles thanks to one obvious feature: the snout. All weevils have an elongated, downward-curving nose (called a rostrum) that’s visible even at their small size. If the bug in your flour has a pronounced snout and is reddish-brown to black, it’s almost certainly a weevil. Pantry moths, by contrast, are winged and leave behind webbing in food. Flour beetles are flatter, lack the snout, and tend to congregate on the surface of products rather than burrowing inside kernels.
The distinction matters because weevils develop inside individual grains, making them harder to spot early. With moths or beetles, you’ll often notice larvae or webbing on the food’s surface before the population explodes. With weevils, the first sign is usually adults appearing seemingly out of nowhere, weeks after the eggs were laid out of sight inside your stored food.