Texas has roughly 1,218 weevil species, according to a Texas beetle resource citing a 2017 estimate, yet most people can name only the one that wrecked cotton fields. Weevils are wide, hard-shelled beetles with a rigid, prominent snout that carries tiny chewing mouthparts at the tip. That snout lets them drill into seeds, buds, stems, and grain.
The weevils in Texas live in very different places. Some tunnel through sweet potatoes in farm fields, some roll up leaves like tiny cigars, and one grows longer than an inch and bores into palm crowns. A few turn up in kitchen pantries.
This article profiles ten of them, from backyard garden visitors to historic crop pests. One name on the list, the Pennsylvania beetle, is not a true weevil at all, and the article explains why. For wider context on the state’s six-legged residents, see this overview of types of insects in Texas.
1. Thief Weevil
“Thief weevil” is a loose common name rather than a tightly defined species. It most often points to small members of the leaf-rolling weevil family (Attelabidae), a group known for stealing a leaf’s tissue to build a nursery. Because the label is applied unevenly, local guides describe slightly different insects under it.
One regional roundup describes small dark brown or black weevils only 2 to 3 millimeters long that feed on legumes, including beans, peas, and clover. At that size, a gardener usually notices the damage before the insect. Look for tiny notches or pinholes in bean and clover leaves, then tap the foliage over a white sheet of paper to spot the beetle.
Thief weevils rarely reach pest levels in home gardens. Their snouts are short and stout compared with those of seed-boring weevils, which helps separate them in photographs. Readers curious about how weevils fit among other beetles and insect groups can browse this guide to different types of insects.
2. Leaf-Rolling Weevil
Leaf-rolling weevils are among the best builders in the insect world. A female cuts a precise slit in a leaf, folds it, and rolls it into a tight tube with a single egg tucked inside. The grub hatches into a ready-made shelter and a meal.
The Texas listing at texasento.net places the family Attelabidae in the state and illustrates species such as Homoeolabus analis, filed there under leaf-rolling weevils. Adults are small, often glossy, and usually reddish or black. Their necks are slightly narrowed, which gives them a compact, almost beetle-bodied look rather than the long-nosed profile most people expect.
The rolled leaves are easy to spot on oaks and other trees in spring and summer. Cut one open and the single grub inside confirms the maker. Damage stays cosmetic on healthy trees, so there is rarely a reason to treat.
3. Sweet Potato Weevil
The sweet potato weevil (Cylas formicarius) looks more like an ant in a metallic costume than a typical weevil. The head is black, the antennae, thorax, and legs run orange to reddish brown, and the abdomen and wing covers are metallic blue. The snout is long and slightly curved.
Growers treat it seriously. It is considered the most serious pest of sweet potato, with losses ranging from 5% to 97%, and it is found across the Southeast from North Carolina to Texas. Writing in Growing Produce, specialists note that it damages crops in the field and in storage, stays active year-round, and peaks in fall and late spring.
Larvae tunnel through vines and tubers, and infested roots turn bitter even with light feeding. Home growers can lower the risk by planting certified clean slips, rotating beds, and removing leftover roots after harvest.
4. Hollyhock Weevil
Few Texas garden visitors are as slender as the hollyhock weevil (Rhopalapion longirostre). It is a small dark weevil with a needle-thin snout nearly as long as its body. Native to Europe and western Asia, it arrived in North America with ornamental hollyhocks.
Females use that snout to drill into flower buds, then lay eggs in the developing seeds. Larvae eat the seeds from the inside, so the plant still blooms but sets fewer viable seeds. Adults feed on foliage and leave neat round holes.
The damage is mostly an annoyance for people who save seed. Picking off infested buds in early summer and clearing spent seed pods in fall breaks the cycle. Most gardeners tolerate the weevil and enjoy their hollyhocks anyway.
5. Pennsylvania Beetle
This one is the odd entry in the lineup. The Pennsylvania beetle is not a weevil, and it has no snout. The name is most often used for the Pennsylvania leatherwing (Chauliognathus pensylvanicus), a soldier beetle that shows up in Texas fields and gardens in late summer and fall.
Important Note: Common names for this insect vary by region, and “Pennsylvania beetle” is sometimes used loosely online. Readers who spot a long-snouted beetle should compare it with the true weevils elsewhere in this article instead.
Adults are about half an inch long, with orange-yellow wing covers marked by black tips and a dark patch behind the head. They gather by the dozens on goldenrod and other fall flowers, feeding on pollen and nectar. Larvae live in leaf litter and soil, where they hunt small insects.
The beetles are harmless to people and good for pollination. Their bold orange and black colors lead some gardeners to mistake them for wasps, so a quick look at the stinging insects in Texas can settle the question.
6. Palmetto Weevil
The palmetto weevil (Rhynchophorus cruentatus) is the heavyweight of this list. It is the largest North American weevil and ranges from Florida to coastal South Carolina and west into coastal Texas. Adults measure about 1.97 inches long and vary from completely black to almost completely red with a variable black pattern.
The weevil targets stressed palms. Females lay eggs in the leaf bases of the crown near existing wounds, and heavy pruning can invite them to lay on pruning cuts. The UF/IFAS Extension office in Lee County explains this in its palmetto weevil guide, and the advice carries over to Texas Gulf Coast landscapes.
A related giant is on Texas officials’ radar. According to PestsGuide, the South American palm weevil was detected in Alamo, Texas, in 2012, but no established breeding populations or palm deaths from it have been confirmed in the state. Coastal homeowners should prune palms sparingly and report any wilting crowns to a county extension office.
7. Cocklebur Weevil
The cocklebur weevil (Rhodobaenus tredecimpunctatus) is a handsome beetle for something that eats weeds. Adults are reddish-orange to pinkish with a scatter of black spots, and the snout is long and curved. It turns up across much of the eastern United States, including Texas.
Larvae bore through the stems of common cocklebur and ragweed, two plants that crop and pasture managers rarely want. Adults chew small holes in the leaves. Sunflowers sometimes host the same grubs, so gardeners occasionally find stem tunneling in their rows.
The weevil is more of a curiosity than a problem. Because it feeds mainly on weedy plants, many naturalists count it as mildly helpful. Look for it in late summer along ditches, field edges, and creek bottoms where cocklebur grows thick.
8. Granary Weevil
The granary weevil (Sitophilus granarius) is the weevil most Texans meet at home. It is one of the weevils that occur in stored food products, and it has elongated punctures on the pronotum and is wingless. That missing flight ability keeps it close to its food, so infestations usually stay inside the bag or canister.
Reproduction is fast in warm kitchens. PestsGuide reports that in warm Texas summers the full lifecycle from egg to adult takes roughly five weeks. The related rice weevil is the more common pantry species in Texas, and the two are easy to confuse.
| Feature | Granary Weevil | Rice Weevil |
|---|---|---|
| Size | Slightly larger, up to 1/4 inch | About 1/8 inch long |
| Color and marks | Darker, with no pale spots | Dull reddish-brown with four faint yellowish marks |
| Flight | Cannot fly | Flies and is drawn to light |
Pro Tip: Move flour, rice, pasta, and birdseed into airtight glass or hard plastic containers, and check new bags before shelving them. Weevils often arrive inside the package from the store.
9. Oak-Mistletoe Weevil
Texas oaks, especially live oaks and post oaks, often carry round clumps of mistletoe high in their branches. Those clumps attract a small community of insects, and the oak-mistletoe weevil is the name given to small weevils found around them. Documentation on this insect is thin compared with that for crop pests.
Important Note: Texas extension sources reviewed for this article do not describe an oak-mistletoe weevil in detail. Treat the identification of any weevil found on oaks as provisional until an entomologist confirms it.
Weevils that do live on Texas oaks are better documented. The Texas A&M Field Guide to Common Texas Insects pictures an acorn weevil, Curculio sp., and these long-snouted beetles drill into acorns to lay eggs. A related pecan weevil occurs only in north central Texas and is medically harmless.
Anyone who finds a weevil in an oak canopy can photograph it, note the tree, and submit the record to a county extension agent or an online naturalist community. Careful photos of the snout, antennae, and wing covers help experts pin down the species.
10. Boll Weevil
No weevil changed Texas more than the boll weevil (Anthonomus grandis). Adults are brown to grayish brown, fuzzy beetles with prominent snouts, ranging from 1/8 to almost 1/2 inch long. The Texas A&M field guide entry notes that it feeds and develops only in cotton and closely related tropical plants.
The insect entered south Texas in 1892 and was devastating cotton crops throughout the South by the turn of the century. The Texas Legislative Reference Library reports that an estimated 700,000 bales were lost in 1904, at a cost of $42 million. It is the reason so many farm towns once looked for crops other than cotton.
The weevil’s life cycle explains why it was so hard to stop:
- Adults overwinter in leaf litter and fly to cotton fields in spring.
- After feeding for 3 to 7 days, they mate, and females lay eggs in cotton squares or bolls.
- Development from egg to adult can finish in 16 to 18 days, and six or seven generations can occur each year.
Eradication has worked. PestsGuide notes that Texas created the Boll Weevil Eradication Foundation in 1993 and split the state into 16 zones covering nearly six million cotton acres. The Handbook of Texas adds that efforts gained momentum in 1994, and by 2013 every region except the Lower Rio Grande Valley had succeeded.
The Rio Grande Valley is still the holdout. NASA Earth Observatory explains that the insect remains a persistent problem there because the climate is warm and humid enough for beetles to survive winter, and new beetles periodically arrive from Mexico. Readers can follow that story in NASA’s report on battling boll weevils. The boll weevil also belongs in any conversation about foreign pests, and this roundup of invasive insects in Texas covers others that followed.
Taken together, these ten weevils show how varied the group is. Some build leaf nurseries, some chew weeds, and a few threaten crops, palms, or pantry staples. Most are harmless to people, since none of them sting or bite. Readers who want to compare weevils with the state’s biting and stinging insects can start with stinging insects in Central Texas and stinging insects in North Texas.
For a closer look at insects people keep and observe at home, the guide to types of insects as pets is a good next stop.