Scientific name: Vespula germanica Family: Vespidae Order: Hymenoptera Risk level: High Category: Flying pest
? What is the German wasp
Scientific name: Vespula germanica
Family: Vespidae
Order: Hymenoptera
Risk level: High
Category: Flying pest
The German wasp (Vespula germanica) is highly aggressive when defending its nest. It has distinctive yellow and black stripes and measures 12–17 mm. It builds paper nests from wood pulp in cavities in the ground and walls. It can sting repeatedly, unlike a honeybee, and its venom can cause fatal anaphylaxis in people diagnosed with insect-venom allergies.
Life cycle of the German wasp
It undergoes complete metamorphosis. Eggs are laid directly on food, and the larva is the damaging stage. A full generation takes 4–8 weeks. Multiple generations may breed in an infested warehouse.
Distribution of the German wasp
It occurs in food warehouses worldwide and is common in the Gulf, Saudi Arabia and Egypt, especially in hot warehouses.
Damage and risks associated with the German wasp
Its multiple stings are very painful. Anaphylactic shock can be fatal in some cases. It can disrupt outdoor dining areas and industrial operations.
Signs of a German wasp infestation
Signs include adult insects around light sources; larvae and silken threads in food (moths); droppings and hollow grains caused by weevils and beetles; and small white eggs on food.
Where German wasps are found
They nest in ground cavities, wall spaces, beneath wooden buildings and in hollow trees. Nests grow from a few individuals in spring to tens of thousands in summer.
German wasp control methods
Monitor with pheromone traps. Spray the warehouse with pyrethroids. Fumigate stored products with phosphine or methyl bromide. For physical control, lower the temperature below 10°C or raise it above 55°C. Rotate stock using FIFO.
German wasp control products
Pyrethroids for warehouses, phosphine (PH₃) for fumigation, deltamethrin for residual spraying and diatomaceous earth for grain.
Requirements for controlling German wasps in food facilities
FSSC 22000 Version 7: stored-product pests are high priority. Pheromone traps with weekly documentation are mandatory. BRCGS: stored-product pests in a product constitute a major Non-Conformance.
A fact about the German wasp
The German wasp is described as one of the most intelligent insects when hunting prey. It cuts large insects with near-surgical precision, removes their wings and legs, then shapes the protein-rich portion into a small ball to carry back to its larvae.
Frequently asked questions about the German wasp
Q: How do stored-product pests enter a facility?
A: Usually through incoming shipments. Carefully inspect samples from each shipment and quarantine new purchases.
Q: Is a low temperature enough to eliminate stored-product pests?
A: Yes. Temperatures below 10°C for two weeks stop reproduction and kill vulnerable stages. Temperatures below −18°C for three days kill all stages
