Case-bearing moths are a common household pest known for their destructive larvae.
The larvae, small white caterpillars with brown heads, create cases from the materials they feed on, often causing damage to clothing or upholstery.
These moths may also be found on walls, where their larvae can cause harm to wallpapers or wall hangings.
They feed on various materials, making them a widespread concern for homeowners. For instance, they can target a range of fabrics, from wool to silk.
To prevent infestations, proper storage and regular cleaning of textiles are essential.
Additionally, maintaining low humidity levels can deter case-bearing moths from settling in your home.
Case Bearing Moth on Walls Identification
The two most common species of case-bearing moths are Tineola bisselliella and Pheropeica uterella. They have some distinct features:
- Flattened body
- Forewings with fringe
- Small wingspan
A comparison of their features can be seen below:
|Feature||Tineola bisselliella||Pheroeca uterella|
|Wingspan||approximately 1/2 inch1||similar size2|
|Body color||gold with reddish-golden hairs1||grayish-white with a mottled pattern2|
|Markings||row of golden hairs fringing the wings1||small dark spot near the wing tip2|
Both species have a similar lifecycle:
- Eggs laid on fabric or other surfaces1
- Larvae hatch and create a silken case1
- Larvae undergo several molts before pupation1
- Adult moths emerge and mate1
Larvae of both species are nearly identical, but Pheropeica uterella always carry a silken case1.
Taxonomy and Distribution
Case-bearing moths belong to:
- Order: Lepidoptera
- Family: Tineidae3
Feeding Habits and Habitat
Case-bearing moths, specifically their larvae, primarily feed on natural fibers such as:
- Fur: Animal fur can be found in various items, like clothing and stuffed toys.
- Wool: Commonly used in carpets, blankets, and clothing.
- Hair: Including human hair, which can be found in brushes or fallen strands.
- Silk: A material used in various fabrics like clothing and bedsheets.
- Feathers: Often used in pillows and duvets.
Additionally, these larvae can also consume:
- Cotton: A relatively common fiber used in clothing and linens.
- Lint: Accumulated fibers in corners and crevices.
Larvae of the case-bearing moth, Tineola bisselliella, are known to feed on keratin, which is found in animal hairs and feathers.
Preferred Living Spaces
Case-bearing moth larvae prefer living in:
- Crevices: Dark, hidden spaces where they can spin their protective cases.
- Wool carpets: A perfect blend of food and shelter for the larvae.
- Soil and sand: They can sometimes be found in soil or sandy areas with ample access to water.
Types of Case Bearing Moths
Tinea pellionella, also known as the casemaking clothes moth, is a small moth with a 1/2 inch wingspan and a yellowish color.
It is prevalent in many regions across the US. The larvae are small, white caterpillars with brown heads feeding on the surfaces of infested material.
- Small size
- 1/2 inch wingspan
- Yellowish color
- White larvae with brown heads
Plaster Bagworm Moths
Plaster bagworm moths, also known as household casebearers (Phereoeca dubitatrix), are similar to other case bearing moths.
They build protective cases from fibers, debris, and silk, attaching them to walls and other surfaces.
The larvae are responsible for feeding on fabric and fibers.
- Protective cases made from fibers, debris, and silk
- Feed on fabric and fibers
- Common in southern states like Louisiana, Mississippi, Georgia, and South Carolina
Webbing Clothes Moths
Webbing Clothes Moths, such as Tineola bisselliella, live and feed on a variety of materials, including natural fibers, synthetic textiles, and other organic materials.
Signs and Symptoms of Infestation
When dealing with a case bearing moth infestation, you might notice some visible signs on your walls, such as:
- Small, white eggs
- Faint silvery trails left by caterpillars
These signs are an indication that the moths have laid their eggs on the walls, and their larvae are beginning their life cycle.
Damage to Clothes and Materials
The most evident sign of a case bearing moth infestation is the damage they cause to your clothes and other materials. You may notice:
- Small holes in clothing, upholstery, and other fabrics
- Shed skins from the caterpillars
An example of damage could be a small hole in a wool sweater.
Pupal Cases and Caterpillars
Another crucial sign of infestation is finding pupal cases and caterpillars around your home. They can often be found in:
- Cracks and crevices
- Spider webs
- Cocoons among clothes or debris
Keep an eye out for small, cigar-shaped cases that house the moth larvae.
As a quick comparison between a clothes moth infestation and a case bearing moth infestation:
|Clothes Moth||Case Bearing Moth|
|Eggs||Creamy white||Small, white|
|Damage to clothes||Irregular holes||Small holes|
To handle an infestation:
- Vacuum regularly, reaching crocks and crevices
- Clean infested areas thoroughly to remove debris and eggs
While both pests require similar approaches, knowing the signs of each can help you identify the specific type of infestation you’re facing.
Prevention and Treatment
Regular cleaning is vital to prevent case bearing moths from infesting your walls. For example:
- Vacuum regularly: Clean carpets, upholstered furniture, and walls to remove moth eggs and larvae.
- Maintain low humidity: Keep humidity levels below 50% by using a dehumidifier or opening a window.
- Deal with stains: Clean sweat, insect droppings, and other stains that could attract moths.
- Check for nests: Inspect your home for bird nests, as they are common breeding grounds for moths.
Moth Traps and Pheromones
Using moth traps and pheromones can help in both prevention and treatment. Some advantages and disadvantages of using these methods include:
- Non-toxic and pesticide-free
- Targets specific moth species
- Easy to apply and monitor
- Requires regular replacement
- Might not attract all moth species
- Can be expensive over time
A moth killer kit containing pheromone traps can be an effective tool for treating existing infestations and preventing new ones.
Pest Control Services
Hiring a pest control service can be a more comprehensive solution for treating case bearing moth infestations.
Some factors to consider when choosing a pest control service are:
- Experience: Look for a service with a history of successfully treating moth infestations.
- Techniques: Ensure they use safe and effective methods, such as targeted treatments for carpet moths and case bearing moths.
- Warranty: Verify if they offer a guarantee for their work.
In conclusion, combining cleaning techniques, moth traps with pheromones, and professional pest control services can effectively prevent and treat case bearing moth infestations on walls.
Keep the environment clean, maintain low humidity, monitor for moth activity, and consult a professional if the problem persists.
Over the years, our website, whatsthatbug.com has received hundreds of letters and some interesting images asking us about case bearing moths. Scroll down to have a look at some of them.
Letter 1 – Household Casebearer Moth Larva from Bangladesh
Subject: Is this bug harmful? My family members are afraid of it.
Geographic location of the bug: Bangladesh
Time: 03:56 AM EDT
Your letter to the bugman: This type of bugs I found on my floor for the first time. They moves here and there and all over my home.
A larva outs it’s head frequently and moves.
How you want your letter signed: Please let me know is it harmful or not including its name and species. Thanks in advance.
This is a Household Casebearer Moth Larva in the family Tineidae, a cosmopolitan household intruder that is a nuisance, but it is not dangerous. According to Featured Creatures: “Many species in this family are casebearers and a few are indoor pests of hair fibers, woolens, silks, felt and similar materials.”
Thanks a lot for your kind and quick reply.
I’m greatful to you.
Letter 2 – Mealy Moth
Years ago we brought a bug into our house in some paper products. It had three stages – the egg, the moth, and what looks like the cocoon after the moth leaves it. (I’m kinda remembering that there was a worm stage, too?) It infested every area of our house and took drastic measures to get rid of.
The moths seemed to like dark places and this is the stage we are seeing now in our house. I purchased a different brand of toilet paper and found some strange hump-like places in one of the rolls and little pieces of the paper fell out. Our first infestation was in Oregon and we live in Montana now.
I was hoping to see a picture of the moth on your website but did not find it. Is what I am describing possibly called something different? If you can’t answer my questions, do you know of who I could go to for help?
Thank You and Blessed Holidays,
Webbing Clothes Moths (Family Tineidae) can be found wherever organic textiles are stored. They are the moths famous for destroying fine wool sweaters and suits. They will also eat cotton, but prefer wool. It is the caterpillar stage that does the damage.
There is a another moth called the Case-Bearing Clothes Moth, Tinea pellionella, that can be identified by the case it carries. The structure is an elongate flattened sac that is made of silk and is slightly splayed at the open end. The larvae carry this case about with them and eventually pupate within. They are often found is wool and silk, but they could possibly feed off of cotton products.
The Indian Meal Moth, on the other hand, is just one of several Pyralid or Pantry Moths that infest stored food products. The adults resemble small generic moths that can be found on the inside of cupboard doors as well as fluttering aroung lights in the house at night.
The larval form is a small white caterpillar that infests the food products. One species, the Meal Moth, Pyralis farinalis, has larvae that build silken tubes or cases that are mixed with food debris. I once had a disgusting box of cornmeal that was totally infested. The Indian Meal Moth lives in the food source within masses of webbing.
Sorry we have no photos since our readers to send them in. Usually a description will suffice in the case of these destructive house pests.