Mealworms are nuisance pests that can cause big problems for stored food. For businesses in food service and distribution, these little bugs can cause sanitation problems and cut into profits. They’re the larval form of the mealworm beetle, and they usually infest stored grain.
If your business is dealing with a mealworm problem, count on the pros at Assured Environments to take care of it for you.
Mealworms leave bite marks and small holes in packaging for stored dry goods. You may find signs of damage or tampering on cardboard or other food packaging, particularly in dry storage.
When mealworms eat through packaging, they often produce a distinctive dry, paper-like waste. This waste looks somewhat dusty. You may find it both outside and inside of food containers.
Size: Larval mealworms measure ½ inch on average. They can be as small as ⅛ inch and as long as 1 inch.
Color: Adults are dark-colored beetles with a hard shell. Mealworms are the larval form of this beetle; they’re yellowish-brown with ringed, segmented bodies. They may look darker near the ends of their abdomen and head and each segment.
Body: Mealworms have evenly-spaced grooves resembling body segments running along the length of their abdomen.
Scientific Order: Coleoptera
Common Species: Tenebrio molitor, or Yellow Mealworm, the larval form of the mealworm beetle, a species of darkling beetle.
Your first step toward preventing mealworm infestations is removing potential shelters or food sources. Remove decaying material such as fallen leaves, compost, or old vegetation away from the perimeter of your building. Next, keep an eye on all your cabinets, closets, and storage areas, especially where you keep food and other dry goods. The ideal mealworm infestation site is dark, humid, and warm, so look for the pest especially carefully in basements, warehouses, attics, and pantries.
Remove any mealworms you find using a vacuum and throw out the affected food immediately. If you find mealworms, check nearby food sources especially carefully as well. Recheck any damp, dark spaces for signs of mealworms periodically even after treating an infestation thoroughly.
Mealworms typically feed on anything they can find that is damp, decomposing, or moldy. They’re particularly fond of dead leaves, foliage, animal waste, and moldy or moist grain products. They’ll frequently infest pantry items like oatmeal, flour, cereal, oats, and other dry goods.
Mealworms feed continuously, stopping only to shed their skin – a process known as molting. As they feed, the larvae use their hardened heads to push and tunnel through food. Once inside the food, mealworms may be hard to spot at first. Fully-grown beetles cannot burrow but gain the ability to fly and release a foul-smelling chemical from a scent gland. They’ll produce this foul scent whenever they’re disturbed or threatened.
Mealworm beetles go through four developmental stages: egg, larva, pupa, and adult. The length of each developmental process depends on the temperature of the environment and how readily available food is. Their typical mealworm life cycle is between 3 and 12 months.
A single female mealworm can produce over three hundred small, white, bean-shaped eggs at a single time. Larva hatch from eggs in 18 days or less and begin eating, moving, and infesting food products immediately. Mealworms may stay in their larval stage all winter if temperatures are too low. Otherwise, they’ll eat and grow continuously, shedding their skin multiple times until they’re fully grown. Adult beetles grow wings, which they use to seek out new mates.
Mealworms are tiny bugs with big appetites. Without prompt treatment, they can eat their way through a lot of your business’s stock. If you’re dealing with a mealworm infestation, count on the team at Assured Environments to help you take care of it. Our team has been serving New York since 1934, and we’re ready to put our decades of experience to work for you.
Give us a call to get started today with a free pest inspection!
A mealworm is the larval stage of a flour (or mealworm) beetle.
Anything damp, rotten or moldy. They will eat decaying leaves, plant matter, other insects and dead animals. In your home they will gravitate towards cereals, grains, seeds and pet food.
Yes. Mealworms can digest both polystyrene and polyethylene – plastics commonly found in bags, bottles and containers. Not only can they digest these plastics, they remain a safe, protein source for other animals. Some see mealworms as a solution to the plastics problem however, it takes 4,000 worms a week to eat one Styrofoam cup.
In the wild, mealworms live in leaf litters, under rocks and logs or in animal burrows. They enter your home through small holes and cracks around your foundation.
Yes. Mealworm larvae molt (shed their skin) 10-14 times before they pupate into their final adult beetle form.
No. They may startle you, but mealworms are not dangerous to humans. Many pet owners feed mealworms to their reptiles and rodents. Mealworms have also been approved as a safe food source for humans, so go ahead and bite them.