Brent goose

Taxonomic position. The Brent goose (Branta bernicla) is a member of the order Anseriformes and the family Anatidae. While being a significant species in Arctic ecosystems, it is also recognized as an agricultural pest in regions where its migration routes overlap with intensive farming areas, particularly in Europe and North America.

Affected crops and damage. The primary crops damaged by Brent geese are winter cereals, including wheat and barley, as well as pastures and perennial grasses. The birds graze on the tender green shoots, often removing the plant material down to the soil level, which can significantly stunt growth and result in reduced yield potential at harvest.

Biology and cycle. This species breeds in the high Arctic tundra during the summer and migrates southwards to winter in coastal regions and agricultural plains. During these stopovers, they form large, highly social flocks that require massive amounts of energy, leading them to exploit high-protein, easily accessible agricultural forage.

Nature of injury. The damage is characterized by uniform grazing patterns where large patches of crops are stripped of their foliage. Because the birds consume the growing point of young plants, the ability of the crop to recover is severely compromised, leading to thinning of the stand and creating gaps that may become susceptible to weed infestation.

Control measures. Integrated management is essential as the species is often protected by wildlife regulations. Effective non-lethal strategies include the use of acoustic deterrents such as propane cannons, visual scarers like raptor silhouettes or reflective materials, and the active management of 'sacrificial' forage areas to lure flocks away from vulnerable commercial crops.