Other pests

Stored Product Insects (SPIs) in Food Production

Stored product insects (SPIs) are a major concern for the food industry, causing contamination, product loss, and regulatory issues. From grain silos to bakeries and warehouses, infestations can spread rapidly if not addressed.

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Stored product insects

At ThermoPest, we specialise in controlling these pests using heat treatment technology, which kills all life stages — egg, larva, pupa, and adult — with minimal chemical use.

Indian Meal Moth (Plodia interpunctella)

Where found: Stored cereals, flour, dried fruits, nuts, cocoa, spices.
Signs: Webbing in stored food products, larvae crawling on packaging, adult moths flying in storage areas.
Risks: Contamination with silk webbing, frass, and larvae makes products unsellable.

See how our SPI heat treatments deal with Indian Meal Moths quickly and thoroughly.

Warehouse Moth (Ephestia elutella)

Where found: Cocoa, nuts, dried fruits, tobacco, and cereals.
Signs: Larvae tunnel into foodstuffs, creating clumps and webbing.
Risks: Infestations spread quickly and damage high-value products.

Learn how ThermoPest heat treatment treats Warehouse Moths in sensitive food environments.

Grain Weevils (Sitophilus granarius) & Rice Weevils

Where found: Whole grains (wheat, rice, maize).
Signs: Tiny holes in grain kernels, presence of dust-like frass.
Risks: Reduce weight and quality of stored grain, making it unfit for sale.

Our food production heat treatment penetrates deep into grain storage, killing hidden weevils and larvae inside kernels.

Saw-Toothed Grain Beetle (Oryzaephilus surinamensis)

Where found: Cereals, nuts, dried fruit, chocolate.
Signs: Active adults crawling inside packaging, gnawed packaging.
Risks: Common in food-processing plants; difficult to control once established.

Find out why heat treatment for SPIs is a fast way to stop beetle infestations spreading.

Flour Beetles (Tribolium castaneum & Tribolium confusum)

Where found: Flour mills, bakeries, grain stores.
Signs: Infested flour takes on a foul odour; adults and larvae visible in product.
Risks: Rapid breeding cycles make infestations hard to control without decisive action.

Our commercial pest control services include tailored treatments for flour beetles in bakeries and mills.

Biscuit Beetle (Stegobium paniceum)

Stored flour, bread, biscuits, cereals, spices.
Signs: Round exit holes in food packaging, small reddish-brown beetles present.
Risks: Infests packaging as well as products, spreading quickly through storage.

See how our SPI heat treatment protects food businesses from Biscuit Beetle infestations.

Why ThermoPest

Why Choose ThermoPest for SPI Control?

Heat treatment kills all life stages of stored product insects, and treatment is carried out in a single visit.
Heat-led with minimal chemical use, suited to food production environments.
Fast turnaround — minimal downtime for production lines.
Nationwide coverage — trusted by food manufacturers, warehouses, and commercial kitchens across the UK.

Protect your food production business with our stored product insect treatment.

Talk to a specialist

Tell us what you’ve found and where. We’ll explain your options and arrange a site survey.

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