Keeping rodents and insects out of the warehouse

Rodents and insects in a warehouse are usually noticed only after the damage is done: a gnawed sack, spilled flour, torn cardboard, droppings on the goods. A whole batch becomes unusable and the customer complains. At risk are food and grain, but also fabric, paper, cardboard, cables and plastic packaging. Protection consists of good order, closed entry routes and regular observation; strong chemicals are a last resort, and only a specialist should use them.

Spot the signs early

To find the problem before the damage grows, watch for:

• small, dark, elongated droppings along walls and in corners;
• gnawed sacks, packaging or cable insulation;
• "nests" made of scraps of cardboard, fabric and paper;
• spilled flour or grain, small holes around the goods;
• greasy, smooth marks along walls, which are paths rodents use all the time;
• flying moths, beetles, cobwebs, an unusual smell.

Do the check after work ends, when the light is low: rodents are active at night. Use a torch to examine the space under racks, the corners and the line along the walls. Record every sign found with its date, place and a photo, so that later you can compare them.

Where they come from

A rodent can get through a very small gap. Typical routes: the gap under a gate, unsealed holes where pipes pass, a ventilation grille, drains, voids under the roof, doors left open for long during loading. Insects and their larvae arrive with incoming goods, wooden pallets and cardboard. So checking packaging at receiving is part of the defence: if you see a hole, traces of flour, live insects or fresh droppings, set the pallet apart and write a report.

Order as the first defence

In a messy warehouse a rodent finds somewhere to hide. Simple rules solve a lot:

• goods stand at least half a metre from the wall, leaving a path for inspection;
• pallets are raised off the floor, and goods do not lie directly on it;
• food and leftovers are not kept inside, and the eating area is outside the warehouse;
• rubbish sits in a lidded container and is taken out every day;
• empty cardboard and pallets are not piled up for long, since they become nests;
• spilled goods are cleaned up at once;
• old and unusable stock does not pile up in a corner; it is removed or kept apart;
• the gate is shut as soon as loading ends.

The yard and the season

Protection does not end at the warehouse wall. Overgrown weeds, piled rubbish, standing water and old pallets in the yard give rodents cover and water next to the building: keep them away from the wall and move the waste area further from the building. The season matters too. In autumn, as the cold arrives, rodents seek a warm place, meaning your building, so inspection and sealing of gaps are done before autumn begins. In hot summer weather insects multiply quickly: then step up checks when handling food, grain and textiles.

Monitoring and a specialist service

Do not scatter poison or other chemicals around on your own, especially near food: it is dangerous to people and goods. Instead, contract an authorised pest-control service. Its staff place traps and bait stations, number them on a map, replace them regularly and report. On your side you need a plan of the warehouse, a log in which signs at each point are recorded weekly, and a responsible employee.

A conditional example. At point 7 on the map, signs were found three weeks in a row. The search for a cause revealed a gap under the gate. It was closed and the signs vanished. Without a log this pattern would have gone unnoticed.

There are non-chemical barriers too: a seal under the gate, metal mesh over pipe openings, fine mesh over ventilation grilles. This is a one-off cost, but it reduces losses that would otherwise recur every month.

Common mistakes

• Relying only on chemicals and neglecting order.
• Setting traps and forgetting the records and checks.
• Leaving food scraps or rubbish in the warehouse overnight.
• Cleaning up the consequences instead of looking for the cause when signs appear.

Conclusion

Pest control is not a one-off action but a continuous process. During a warehouse audit, SkladKontrol also looks at storage conditions, and in a stock count report spoiled goods can be separated from quantity differences.