Larder beetles (Dermestes lardarius) are common household pests often found in pantries or other food storage areas. This guide provides information on their habits, identification, and effective management strategies for homeowners.
Do Larder Beetles Bite?
Larder beetles do not bite humans or pets. Their mouthparts are designed for chewing and consuming solid materials, not for piercing skin. Any perceived “bite” is likely a misidentification of another insect or, in rare instances, a mild skin irritation from contact with bristly larder beetle larvae hairs.
These beetles primarily feed on dried animal products like cured meats, dried fish, cheese, pet food, animal hides, furs, and dead insects or animal carcasses. Their presence in a home often signals an underlying pest issue due to these feeding preferences.
Identifying Larder Beetles and Their Habits
Adult larder beetles typically measure about 7 to 9 millimeters (approximately 1/3 inch) long and have an oval-shaped body. They are dark brown or black, distinguished by a broad, pale yellow or tan band across the upper portion of their wing covers, which usually contains six dark spots. These beetles possess short, clubbed antennae and are capable of flight.
Larder beetle larvae grow up to 13 to 15 millimeters (about 1/2 inch) long. They are reddish-brown to dark brown, covered in long, bristly hairs, and have two stout, curved spines projecting backward from their tail end. Larder beetles undergo complete metamorphosis: egg, larval, pupal, and adult stages. Females lay eggs on or near food sources, with eggs hatching in about 12 days and the larval stage lasting approximately 40 to 50 days.
Larder beetles are attracted to homes by high-protein food sources. They commonly establish themselves in areas like pantries, attics, basements, and within wall voids. Larvae may also bore into materials like wood, plaster, or insulation to create a protected space for pupation.
Dealing with Larder Beetles
Managing larder beetles begins with a thorough inspection to locate the infestation source. This often involves checking dried pet food, stored pantry items, taxidermy, and areas where dead insects or rodents might accumulate, such as attics, wall voids, or basements. Removing the food source is the most effective step in eliminating these pests.
Once the source is identified, dispose of infested items immediately in sealed bags and remove them from the home. Thoroughly clean affected areas by vacuuming shelves, cracks, and crevices to remove beetles, larvae, and shed skins. Wiping down surfaces with a mixture of water and white vinegar can also help eliminate food residues and odors that attract beetles.
Preventative measures help avoid future infestations. Store all food products, especially dried meats and pet food, in airtight containers made of glass or sturdy plastic. Seal entry points into the home, such as cracks or gaps in walls, windows, and vents, to prevent beetles from entering. Address any issues with dead insects or rodents within the home, as these are food sources for larder beetles. For severe or persistent infestations, particularly if the source is inaccessible, consulting a professional pest control service is recommended.