What Are Merchant Grain Beetles?
The merchant grain beetle is a common stored product pest found throughout the United States in homes, grocery stores, food warehouses, and grain storage facilities. Similar in appearance to the sawtoothed grain beetle, the merchant grain beetle has the ability to fly, while the sawtoothed grain beetle does not. They are incapable of attacking sound grain kernels and often occur in food previously infested by other stored product pests. Their flattened body allows them to easily penetrate broken kernels of grain and packaged materials. Not only do they contaminate food, they often cause mold problems due to moisture build-up.
Merchant grain beetles are common in Florida, particularly in areas with high humidity and temperature fluctuations. They are frequently found in homes and businesses that store dry goods, making Florida a prime environment for infestations. These pests are known for their rapid reproduction and ability to spread quickly through infested food products.
What Habitats Are Merchant Grain Beetles Found In?
Merchant grain beetles are commonly found in food manufacturing, storage, retail facilities, and home pantries. These stored product pests can infest and contaminate a variety of dry foods, including breakfast foods, cereals, macaroni, candy, chocolate, sugar, cake mixes, brownie mixes, nuts, dried pet food, bread, rolled oats, biscuits, cornmeal, and more. A single female beetle can lay up to 250 eggs within cracks of kernels of grain. While the larvae cause the most damage by feeding on the infested food, the adults are the most commonly encountered stage of the beetle. A merchant grain beetle infestation is often first noticed when adult beetles are discovered crawling around pantry areas, especially in foods that have been left in open containers.
How Does An Infestation of Merchant Grain Beetles Begins?
Merchant grain beetle infestations usually begin when infested products are brought into a home or business. Most commonly, these pests are already present in products purchased from grocery stores, with the larvae or adults hitching a ride in the packaging. Once the beetles are inside, they can quickly reproduce, especially in warm, dry environments. It only takes a few beetles to start an infestation, and the problem can escalate rapidly if left unchecked.
Warning signs of an infestation include the presence of small beetles crawling around dry food packages and finding holes or signs of damage in stored grains. Additionally, if you discover mold or a musty smell in pantry areas, it could be a sign of merchant grain beetles or other pantry pests. The risks of transporting grain in unsafe ways—such as moving it in open, non-airtight containers—can exacerbate infestations, leading to a broader problem once the pests spread.
Are Merchant Grain Beetles Dangerous?
Merchant grain beetles do not bite or sting and are not known to carry or transmit any diseases to humans. They are nuisance pests and will contaminate and damage food that is stored in the home. Adults can readily enter sealed cardboard boxes and soft plastic packaging. Merchant grain beetles typically enter homes in products purchased from grocery stores that are already infested with larvae or adults. The primary infestation usually originates at the manufacturing facility where the product was produced. If you suspect a merchant grain beetle issue on your property, contact your local pantry pest control experts.
What Is The Merchant Grain Beetle Life Cycle?
The merchant grain beetle has four stages in its life cycle: egg, larva, pupa, and adult. The cycle begins when a female lays up to 250 eggs in cracks or crevices of damaged grain kernels. The eggs hatch into larvae, which feed on the grain and continue to grow. As larvae mature, they pupate and eventually emerge as adult beetles.
A single merchant grain beetle can live for several months, with a full life cycle taking anywhere from 4 to 6 weeks, depending on environmental conditions like temperature and humidity. Because of their rapid reproduction and short life cycle, these beetles can quickly spread throughout a storage area, infesting additional food products. Understanding the stages of the merchant grain beetle life cycle can help you recognize and address an infestation before it becomes too widespread.
How To Prevent Merchant Grain Beetles
Preventing merchant grain beetles from infesting your home or business begins with proper food storage. Store dry goods such as flour, oats, and other grains in airtight containers to keep pests out. Regularly check food products for signs of infestation, including holes in packaging or visible beetles.
It’s also a good idea to clean pantry shelves frequently, removing any spilled food or debris that could attract beetles. Additionally, keep pantry areas dry and cool, as moisture can attract pests and foster mold growth, which is often associated with merchant grain beetles.
Need help with Merchant Grain beetles?
We'll call you! Leave your information below.
Frequently Asked Questions
Are Merchant Grain Beetles Harmful?
Merchant grain beetles are not directly harmful to humans, but they can cause contamination in stored food products, potentially leading to illness if consumed.
What Kills Merchant Grain Beetles?
To eliminate merchant grain beetles, it’s essential to remove any infested food and properly dispose of it. Cleaning pantry areas and using airtight containers for food storage can help prevent re-infestations. If necessary, professional pest control treatments can be used to eradicate the beetles.
What Is The Difference Between A Sawtooth And A Merchant Grain Beetle?
While both pests are similar in appearance, the main difference between the sawtoothed grain beetle and the merchant grain beetle is that the latter can fly, while the sawtoothed grain beetle cannot. Additionally, the merchant grain beetle typically has a more flattened body shape and a slightly different color pattern.
Can Merchant Grain Beetles Fly?
Yes. Merchant grain beetles can fly, allowing them to spread more easily between different food storage areas and locations.