A 12,000-Tonne Rice Warehouse Was Struck Off the Approved Supplier List After Live Insects Were Found in a Container at the Port
Last updated: 7 Sep 2026 | 9 Views |
A true story from a rice mill and warehouse in Suphan Buri, Thailand
A 12,000-Tonne Rice Warehouse Was Struck Off the Approved Supplier List After Live Insects Were Found in a Container at the Port
When a handful of insects in one container costs a customer built over ten years — and the lesson about insect control most warehouses still have not learned
A rice mill and warehouse of 12,000 tonnes capacity in Suphan Buri was struck off a major exporter's approved supplier list after live insects were found in a container at the port, costing more than 30 million baht of orders a year. Here is the real cause, and how the AIROFOG AT35 thermal fogger became the missing layer that got the warehouse re-approved.
Teera, 52, runs a rice mill and warehouse of 12,000 tonnes capacity in Si Prachan district, Suphan Buri, a business he inherited from his father. It took him ten years to become an approved supplier to a major exporter shipping to Middle Eastern and African markets.
Last October he took a phone call he says he can still recite word for word. The exporter's procurement team told him that two containers loaded from his warehouse had been found to contain live insects during the pre-shipment inspection at Laem Chabang port.
The consequence did not end with two returned containers. The exporter suspended all orders immediately and advised that his warehouse would be removed from the approved supplier list until he could demonstrate an auditable insect control system. The lost orders were worth over 30 million baht a year.
What the external auditor found inside the warehouse
Teera hired a stored-product pest control auditor to inspect the entire facility. It took three days, and the report showed him he had misunderstood the problem for twenty years — because what he had always done was fumigate the stacks, which handles insects in the product but does nothing about insects in the building.
The auditor showed him that stored-product insects do not live only in the grain. They live in the roof structure, wall cracks, column recesses, under pallets, in spilled grain accumulated in corners, and in the empty sack store — all of them harbourages from which the population re-infests each new stack after every fumigation.
The most serious finding was the bagging and container loading area: an open zone with the heaviest grain spillage on site, and one that had never been treated at all, because fumigation only works in sealed spaces. Insects from that zone entered containers directly at the very last step before export.
The auditor's summary is a line Teera wrote down: fumigation handles what is in the stack, fogging handles what is in the building. Do only one and the system is incomplete, and the problem always comes back.
Why agricultural warehouses are harder to control than people assume
An agricultural warehouse is several times harder to control than a general one. First is food. A rice warehouse is an enormous food supply for stored-product insects — rice weevils, flour beetles, rice moths and several others. Insects that get in have no reason to leave.
Second is the building. Most warehouses are steel-framed structures full of gaps, joints and recesses — in high roof structures that cleaning never reaches, and in cracked walls. These are safe harbourages and the source of re-infestation into product.
Third is throughput. Goods move in and out constantly, which means large doors opening, trucks coming and going, and product arriving from other sources that may carry insects undetected at intake.
Last is residue. Grain spilled into corners, under conveyors, in floor channels and inside empty sacks is a continuous food source and breeding medium. Even a few kilograms is enough to sustain a population in the building year-round.
What failing an inspection actually costs
The 30 million baht a year of lost orders is the clearest figure, but Teera says the real damage runs several layers deeper. First was handling the two returned containers: return freight, re-fumigation, re-sorting and contractual penalties — roughly 1,200,000 baht.
Second was the rice in those containers, which had to be re-sorted, losing both quality and weight, and was ultimately sold at a lower price domestically. Third was the consultancy and system upgrade costs required to apply for reinstatement.
But the heaviest cost, he says, was time. Ten years building the relationship, lost in a single phone call. Getting back on the list meant a stricter audit than before and at least another full season.
He adds that word travelled through the industry extremely fast, because there are only a handful of major Thai rice exporters and everyone knows everyone. He ended up explaining the same incident to several other customers who had nothing to do with it.
The new system that got the warehouse re-approved
Teera rebuilt the system on the auditor's advice in three layers. The first is building hygiene: daily removal of spillage, sealing wall cracks, cleaning pallets and empty sacks, and separating the sack store from the product store.
The second is fumigating the stacks to standard, which he already did, but now with proper recording and verification, plus pheromone traps for monitoring so the results are a number rather than an impression.
The third — the layer he had never had — is thermal fogging inside the building: the roof structure, walls, column recesses, the sack store, and above all the bagging and loading area, the last point before goods leave the warehouse.
He chose two AIROFOG AT35 units, because they are shoulder-carried machines that let staff cover a large warehouse thoroughly, the stainless body tolerates grain dust and humidity, and service and genuine parts are available inside Thailand — essential for a business that cannot pause during the buying season.
What it actually costs
Losing an export customer means losing the year's core revenue
More than 30 million baht a year is a large enough share to affect the whole mill's cash flow — from its ability to buy paddy from farmers to the jobs it supports.
Penalties and the cost of handling returned containers
Return freight, re-fumigation, re-sorting and contractual penalties came to over 1,200,000 baht for two containers alone — dozens of times the cost of quality fogging equipment.
Reputation in an industry with very few players
There are only a handful of major Thai rice exporters and they all know each other, so news of a failed inspection travels fast, forcing you to explain the same incident to customers who were never involved.
Product quality and value
Returned rice must be re-sorted, losing weight and quality and selling for less. And insects in a stack generate heat and moisture, which drives broader deterioration through the product.
Why the usual fixes do not work
Fumigating the stacks only
Fumigation handles insects in the product well, but not those in the building — in the roof structure, wall cracks and sack store. Those re-infest each new stack after every fumigation, so you fumigate again and again with no end point.
Cleaning only what you can see
Daily sweeping is essential, but most insects hide where a broom never reaches: high roof structures, floor channels, under conveyors, and the recesses between walls and columns. Cleaning is necessary but not sufficient.
Fitting insect screens to doors and vents
Worth doing and it reduces new entry, but it does nothing about the population already inside — and a warehouse with trucks moving all day can never be truly sealed.
Spot-spraying with aerosol cans where insects are seen
This covers a tiny area and dissipates quickly. A 12,000-tonne warehouse has thousands of square metres and a roof structure over ten metres up. And by the time you see insects, the population is already established.
Hiring a contractor to spray when a problem appears
The per-visit cost is high and the contractor comes on his own schedule, while stored-product control has to be systematic and continuous with records an auditor can review. Ad hoc contracting is both more expensive and fails the audit criteria of major buyers.
Stored-product control must cover both the stack and the building
The principle the auditor showed Teera is that stored-product insect control has two inseparable halves. One is insects in the product, handled by fumigation. The other is insects in the building, which must be handled by fogging.
Fumigate only and the building population re-infests every new stack. Fog only and insects developing inside the grain survive and emerge later. Only doing both makes the system complete and capable of passing a buyer's audit.
A thermal fogger is the right tool for the building half, because the fog rises to a roof structure over ten metres up, penetrates wall cracks and column recesses, and covers thousands of square metres quickly — none of which aerosols or pressure spraying can do.
The machine has to belong to the warehouse, because control must follow a defined schedule with records available to auditors — a condition of every major buyer. That is why Teera chose the AIROFOG AT35, with its 100 percent stainless steel body.
10 reasons the AIROFOG AT35 thermal fogger solves it
1. Fog rises to roof structures that cleaning can never reach
A rice warehouse has a roof structure over ten metres up that cannot be cleaned or treated any other way. The AIROFOG AT35 produces a fog that rises to blanket the roof structure, beams and the cavities beneath the sheeting — the principal harbourage for stored-product insects.
2. Covers thousands of square metres in a short window
A 12,000-tonne warehouse spans thousands of square metres. Aerosols or pressure sprayers would take all day and still miss areas. The AT35's output lets two operators cover the whole building in one to two hours, which makes a weekly schedule genuinely practical.
3. Treats the bagging and loading zone, which fumigation cannot
The zone that caused the failure at the port was the bagging and loading area — an open space that cannot be fumigated because it is not sealed. Fogging it before loading closes the last gap before goods leave the warehouse.
4. A 100 percent stainless steel body that handles grain dust and humidity
Warehouse air carries flour dust and high humidity, which corrodes and clogs ordinary equipment quickly. A fully stainless body handles those conditions far better and washes down more easily — which matters in a food-related facility.
5. Runs both water-based and oil-based formulations
Agricultural warehouses must use products registered for storage premises and rotate them to slow resistance. Accepting both formulation types lets you follow the auditor's guidance and the buyer's requirements.
6. Produces the records auditors and buyers want to see
When the warehouse owns the machine and fogs to its own schedule, every application is logged: date, time, area, product and operator. That is exactly the documentation major buyers and auditors require, and it is what ad hoc contracting cannot provide.
7. Carried on foot through a warehouse full of stacks and pallets
A warehouse packed with grain stacks and pallets leaves no route for a spray vehicle. The AT35 is light enough for staff to walk between stacks and along narrow aisles, reaching every corner including the sack store and beneath the conveyors.
8. Compliant with Thai government standard equipment specifications
For warehouses operated by government agencies, the Public Warehouse Organization, agricultural cooperatives, or state pledging and procurement programmes, meeting the official standard equipment schedule makes budgeting and acceptance inspection straightforward.
9. Certified to German and British standards
For an export business audited by overseas buyers, internationally certified equipment is something you can cite in your insect control documentation, and it carries weight with auditors.
10. A Thai service centre with genuine parts and 10-plus years of technician experience
The buying and export season is when a warehouse cannot stop. If a machine fails and parts take a month from overseas, the control programme breaks and the records show a gap an auditor will spot immediately. Domestic service is essential.
Before the thermal fogger
- Live insects found in two containers at the port
- Orders suspended and removal from the approved supplier list
- More than 30 million baht a year in lost orders
- Over 1,200,000 baht in costs handling the returned containers
- Fumigation of stacks only, with no fogging inside the building at all
- No documented insect control system to show an auditor
After the thermal fogger
- Passed the external audit and returned to the approved supplier list
- No live insects found at pre-shipment inspection across two seasons
- Complete weekly fogging records and pheromone trap counts
- A clear reduction in the number of repeat fumigations needed
- The bagging and loading zone treated before every container load
- New export customers won because the system can be demonstrated
The three-step process
1. Survey the building and map the harbourages
Walk the whole warehouse with the auditor, marking spilled grain accumulations, wall cracks, column recesses, beneath conveyors, floor channels, the empty sack store and the roof structure. Then split the work into what is fixed by repair and cleaning and what requires regular fogging.
2. Fog to a fixed schedule, and before every container load
Set a whole-building application once or twice a week during periods when the warehouse is clear of staff, concentrating on the roof structure, walls, column recesses and sack store. Add a dedicated application of the bagging and loading zone before every container load — the step that closes the last gap.
3. Record and measure with pheromone traps
Place pheromone traps at defined points and count them weekly, logging the results alongside the fogging and fumigation schedule. Those numbers are the evidence auditors and buyers want, and they tell you where frequency needs to increase.
From someone who uses one
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Where stored-product insects hide, and what most warehouses miss
The empty sack store is the most common finding and the most overlooked. Used sacks carry grain residue and are stacked folded together, making them a perfect combination of food and harbourage. The fix is cleaning sacks before storage, separating the sack store from the product store, and fogging that room on every whole-building pass.
Beneath conveyors and in floor channels is the second heaviest accumulation, invisible because normal sweeping cannot reach it. Cleaning under conveyors should be a standing monthly task, and the area fogged on every pass.
Wooden pallets are what many warehouses never consider, because cracks and holes in the timber are excellent oviposition sites, and pallets circulate between areas, distributing insects throughout the building. Inspect pallet condition periodically and remove damaged ones.
Last is the area outside the building: waste material piles, grain spilled at the intake point, and vegetation along the walls, all of which host insects and other pests before they enter. Managing the exterior is an inseparable part of the system.
Why documentation matters as much as the work itself
What Teera stresses most is that major buyers do not want a clean warehouse. They want a warehouse that can prove it is clean systematically. The difference between those two things is documentation.
The record set auditors expect is not complicated: a schedule of fogging and fumigation with date, time, area, product, dilution and operator; weekly pheromone trap counts; cleaning records; and a log of defects found and corrected.
The advantage of owning the machine is that the warehouse controls both the frequency and the completeness of the record. Contracting the work out generally yields only an invoice, which is not sufficient for an export-grade audit.
Over time the record becomes a business asset. When a new buyer audits, the warehouse can produce a full history immediately, which shortens supplier approval substantially and is a differentiator most competitors still do not have.
Frequently asked questions
Can we fog a warehouse with product inside?
Yes, using a product registered for agricultural storage premises at the specified dilution, applied when no staff are in the building, with ventilation for the period the label requires before people return. Consult your auditor on which products your buyer accepts.
Can fogging replace fumigation?
No. They do different jobs. Fumigation handles insects inside the stack and inside the grain; fogging handles insects in the building fabric. A complete system needs both, and major buyers' auditors typically check both.
How many machines does a warehouse of my size need?
Up to about 2,000 square metres, one machine is enough. For 3,000 to 6,000 square metres, two, so a full pass finishes in one to two hours. Multi-building sites should keep a machine at each building.
How often should we fog?
Generally once or twice a week for the whole building, plus a dedicated application of the bagging and loading zone before every container load. Adjust frequency to your pheromone trap counts rather than the calendar alone.
Can warehouse staff operate it?
Yes. Designate two or three responsible operators and train them fully on mixing ratios, protective equipment, application technique and record-keeping — the recording being as important as the application, since it is what the auditor reviews.
Does this apply to other agricultural warehouses?
Yes. The same principles apply to maize, cassava, pulses, coffee and animal feed warehouses, as well as silos and drying facilities, all of which face stored-product pests and have the same harbourages in the building fabric.
What does each application cost?
The running costs are fuel and chemical, typically a few hundred to a thousand baht per application for a mid-sized warehouse, against contracted spraying billed at thousands to tens of thousands per visit. Ownership pays for itself within months.
What if the machine fails during export season?
AIROFOG maintains a service centre and genuine parts in Thailand with technicians of more than 10 years' experience, so issues are resolved quickly. Warehouses exporting continuously are advised to keep at least one spare machine so the fogging record shows no gap.
Ten years to build, one phone call to lose
The most direct lesson here is that a system built over ten years can have one gap, and that single gap is enough to lose everything built on it.
In agricultural export, cleanliness that cannot be proven is worth the same as no cleanliness at all. What buyers purchase is not only rice. It is confidence that every container leaving your warehouse will pass inspection.
Investing in a control system that covers both halves — fumigation in the stack and fogging in the building, with auditable records — is therefore not a cost. It is what keeps the business on the supplier list.
Talk to the World Health Disinfection team about an insect control programme for your warehouse or grain store — machine selection, chemistry, and a schedule you can show an auditor.
See the machine and pricing — click here
Call 065-556-6294 or add LINE @whd268
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Related keywords: thermal fogger, warehouse insect control, grain storage pest control, AIROFOG AT35, rice warehouse, stored product pests
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