Keeping Pantry Insects out of Your Business

If you work with food, you probably spend a lot of time thinking about contamination, hygiene and keeping unwanted visitors out of your premises. But some of the smallest pests can be the hardest to spot.

Stored product insects, or SPIs, can infest ingredients, packaged food, storage areas and even food processing machinery, creating serious problems for businesses that need to maintain high standards of food hygiene.

There are more than 500 common species of stored product insects that can infest a wide range of products, from cereal-based foodstuffs and dried fruit to tobacco and chocolate. Identifying the exact species is critical to understanding how an infestation has developed and determining the most effective control measures.

Warehouse moths, beetles, weevils and their larvae can all pose challenges for food manufacturers, warehouses, retailers and commercial kitchens. Finding an insect doesn't necessarily mean you have a major infestation, but it does mean you should investigate where it came from.

In this blog, we'll explore some common stored product pests, how they enter food storage areas and what businesses can do to prevent infestations from becoming a much bigger problem.

What are stored product insects?

Stored product insects are pests that infest food and other stored products. Unlike pests that are attracted to waste or general dirt, these insects can thrive in perfectly clean commercial kitchens, warehouses, shops and food production environments.

They can arrive in deliveries, enter through packaging or move between products once they are already inside your premises.

Common examples include warehouse moths, Indian meal moths, flour beetles, weevils and grain beetles. Different species target different products, including cereals, flour, grains, dried fruit, nuts, spices, seeds, tobacco and chocolate.

This variety makes stored product insects particularly challenging for food businesses. Even with excellent cleaning procedures, an infestation can develop if contaminated goods arrive on site.

Correct identification is essential because different species have different feeding habits, life cycles and behaviours. Without knowing which pest is present, it can be difficult to locate the source of an infestation or implement effective stored food pest control.

How to get rid of insects in food storage?

The first step is identifying what insect you are dealing with and where it is coming from. Simply killing the adult insects you can see isn't enough if eggs or larvae are still present in food packaging, shelving or machinery.

A thorough inspection should look at food stores, stock rotation, packaging, shelving, cracks and crevices, machinery and other areas where insects could be hiding.

Depending on the pest and the severity of the infestation, control can involve removing contaminated products, improving hygiene and housekeeping, treating affected areas and introducing preventative measures to stop the problem returning.

This is where professional stored food pest control can make a significant difference. A pest control professional can identify the species, investigate the source of the infestation and recommend a targeted treatment plan.

Getting rid of the insects you can see is only part of the solution. Effective control also means addressing the source and preventing further activity.

Can insects get into sealed packages?

Unfortunately, yes. Some stored product insects can enter through tiny gaps in packaging, while others may already be present in food products before they reach your premises.

Certain pantry pests are particularly adept at getting into cardboard boxes, paper bags and thin plastic packaging. Some species can even chew through packaging to reach food inside.

This means that simply keeping food sealed isn't always enough.

Businesses should regularly inspect deliveries for signs of damage, insects, webbing or unusual activity. Stock should also be rotated properly, with older products used first, and potentially infested products isolated while they are investigated.

It's also important to understand that stored product insects don't necessarily remain in the product where the infestation started. Adult moths can move around a building, while some larvae crawl away from their food source before pupating.

If you spot warehouse moths in one area, don't assume that is the only area you need to inspect. A wider investigation may be necessary to identify the original source and determine whether other products or storage areas have been affected.

What is the most common stored product pest?

There isn't one single stored product insect responsible for every infestation. The species involved will depend on the products being stored, the supply chain and the conditions within the premises.

Moths, including species commonly associated with stored food, are among the pests that can cause problems in commercial storage environments. Beetles and weevils are also common stored product pests.

Warehouse moths can be particularly concerning because their larvae may feed within infested products before moving away to find a suitable place to pupate.

Signs of activity can include fine webbing inside packaging, clumping or unusual changes in food, larvae around cupboards and shelving, damaged products or small moths flying around the premises.

Other pests, such as weevils and flour beetles, can be harder to spot because they may spend much of their life cycle close to or inside stored food products.

With more than 500 common stored product insect species to consider, correctly identifying the pest is vital. Treating an infestation without understanding which species is present may fail to address its source or life cycle.

Professional identification helps establish which products are at risk, where to look for further activity and which control measures are most appropriate.

Why do I have moths in my kitchen?

Finding moths in kitchen areas can be particularly worrying for a food business, especially when the kitchen appears clean and well maintained.

The problem may have nothing to do with the cleanliness of the kitchen itself. Moths can arrive inside infested food products and subsequently spread throughout storage areas. Eggs and larvae may also remain hidden in packaging, shelving or other hard-to-reach locations.

Look out for small moths around food cupboards, storage areas and ceilings, as well as larvae, webbing or damaged packaging.

If you keep finding moths in kitchen areas despite cleaning and removing affected products, there may be a hidden source that hasn't yet been identified. Checking incoming deliveries, stored ingredients and nearby machinery can help establish where the activity is originating.

Because different stored product insects behave differently, identifying the species is an important step towards resolving the problem rather than repeatedly treating the visible signs.

Can a business get shut down for stored product insects?

A pest infestation can have serious consequences for a food business, particularly if it is not dealt with promptly and appropriately.

There isn't a simple rule that says every business with stored product insects will automatically be shut down. However, food businesses have legal responsibilities to maintain appropriate hygiene and prevent contamination. A significant or poorly managed pest infestation could therefore result in enforcement action, depending on the circumstances.

The consequences can extend beyond regulatory concerns. For a restaurant, café, bakery, food manufacturer or retailer, insects in stored food can result in contaminated stock, wasted products, complaints and lost customers.

An infestation can also affect a business's reputation, particularly if customers lose confidence in its hygiene standards.

That's why early intervention, accurate pest identification and an effective control strategy are so important. Investigating the issue promptly can help businesses address the source, protect their stock and demonstrate that appropriate action is being taken.

Keeping pantry pests out

The best approach to stored food pest control is prevention rather than waiting until you have insects flying around your premises.

Regular inspections, good stock rotation, effective cleaning and housekeeping, appropriate food storage and careful checking of deliveries can all reduce the risk of infestation.

Staff should also know what signs to look for. A small moth flying around a storage area may seem insignificant, but it could be the first visible sign of a much larger problem.

If you suspect warehouse moths, larvae or other stored product pests are present, don't simply spray the insects you can see and hope for the best. The source needs to be identified and dealt with properly. 

At Aderyn Pest Control, we can help food businesses investigate pest activity, identify the species involved and put appropriate control measures in place. From moths in kitchen areas to insects affecting stored ingredients and food processing environments, professional stored food pest control can help protect your stock, your premises and your reputation.

If you've spotted signs of stored product insects, get in touch with Aderyn Pest Control for advice and professional pest control support.