Warehouses, bonded warehouses, and logistics centers, the heart of the global supply chain, are the longest-lasting waiting points for a product before it leaves the production line and reaches the end consumer. Especially when it comes to the food sector, storages containing thousands of pallets of rice, flour, nuts, coffee, spices, or animal feed together are an endless food source for insects and rodents. The slightest increase in humidity or lack of ventilation in warehouse conditions causes a few insect eggs hidden inside the products to turn into a massive infestation spreading to the entire warehouse within weeks. In a pest-infested warehouse, products do not only suffer physical damage (gnawing, puncturing); at the same time, the "Food Safety" of the product drops to zero due to insect feces, webs, and dead insect parts. In this article, we will detail warehouse pests, the nightmare of logistics warehouses, and Warehouse Fumigation operations, the only definitive way to save products without wastage.
Pests Causing Product Loss (Wastage) in Warehouses
Pests seen in warehouses have usually already settled into the product while it was coming from the factory or field to the warehouse. The stagnation in the warehouse creates an opportunity for them to breed:
- Dried Fruit and Flour Moths: This is the most frequently encountered problem, especially in dried fig, apricot, flour, and spice warehouses. Flying around the ceiling of the warehouse at night, these moths lay their larvae among the products. The larvae weave silky webs over the products, gluing the packaging together and causing the food to completely spoil (mold).
- Rice and Wheat Weevils: They are seen not only in bulk grains but also inside sacked and palletized legumes (chickpeas, beans, lentils). They gnaw through the sacks, causing the products to spill into the warehouse and disrupting their calibration.
- Rodents: Mice building nests in dark corners between pallets consume food and create massive clutter and pollution inside the warehouse by tearing the packaging. Furthermore, they transmit deadly diseases like Hantavirus to foods through their droppings.
Why Is Liquid Spraying Insufficient in Warehouses?
Liquid pesticides sprayed with a backpack pump or ULV machines among hundreds of pallets of goods in a massive warehouse only kill adult moths flying in the air or insects on the floor. It is impossible for liquid pesticide to penetrate inside a pallet wrapped in nylon stretch or inside a grain of rice in the middle of a tightly sewn sack. The larvae, the source of the problem, continue to live inside the product. Furthermore, spraying chemical liquids on food products is contrary to laws and health standards. That's why "Fumigation" in gas form, which can penetrate into the very heart of the product, is the only cure.
How is Warehouse Fumigation Applied?
Depending on the magnitude of the problem, warehouse fumigation is done either by taking only the diseased pallets under a tent (local) or by isolating the entire warehouse (volumetric). Full volumetric warehouse fumigation is an extremely challenging operation:
- Total Isolation (Sealing): All windows of the warehouse, ventilation fans, gaps in the roof, under doors, and even socket holes are made 100% airtight with special tapes, foams, and tarpaulins. Ensuring the sealing of a massive warehouse can take days.
- Gas Release: Phosphine (PH3) or other suitable gases, calculated according to the volume of the warehouse and the nature of the product inside, are placed at critical points of the warehouse. The gas passes through the stretch wraps of the pallets and the texture of the sacks, penetrating to the innermost point of the products.
- Quarantine: The doors of the warehouse are locked, sealed, and warning signs are hung. Depending on the ambient temperature, the warehouse must remain closed for at least 3 to 7 days so that the gas can kill all insect stages (including eggs). Human entry into the warehouse is strictly prohibited during this time.
- Safe Ventilation: At the end of the process, professionals with gas masks open the doors and discharge the gas with industrial fans. When residue measurements show no gas left, the warehouse is reopened for use. The products return to their first-day purity without harboring chemical residues.
Conclusion
The most important factor determining the profit margin in the logistics and storage sector is to keep product wastage to a minimum. Do not remain a spectator as your millions of liras worth of stocks, which you have kept in your warehouse for months, are silently consumed by barely visible insects. Warehouse fumigation is your strongest defense mechanism that protects the value of your stocks, extends their shelf life, and allows you to pass international food safety audits like BRC, IFS, and AIB flawlessly. Store your products safely in your warehouse, let your shipment be pest-free and uninterrupted.