Tree swallow

Systematic position: The tree swallow (Iridoprocne bicolor, also recognized as Tachycineta bicolor) is a passerine bird in the swallow family, Hirundinidae. Widely distributed across North America, these birds are typically beneficial as insectivores, yet they can become a nuisance in specific agricultural settings.

Biology and cycle: These birds are migratory and highly social. They nest in cavities, often competing for nesting sites. Their breeding season is characterized by high activity levels, and during the post-breeding period, they form large flocks that migrate southward, often passing through intensive farming regions.

Nature of damage: While primarily feeding on insects, tree swallows can shift their diet towards fruit when insect populations decline or when berries are abundant. They cause direct damage to blueberries, grapes, and other soft-skinned fruits by pecking, which leads to fruit rot and reduced market quality.

Economic impact: The economic damage is most pronounced in high-value berry production. Beyond direct consumption, the accumulation of avian fecal matter on crops poses hygiene risks, often leading to rejections during post-harvest sorting and processing procedures.

Management strategies: Controlling bird damage requires an integrated approach to avoid harm to the species:

• Deployment of physical exclusion methods, such as bird-proof netting.
• Use of visual deterrents, including hawk kites or reflective tapes.
• Implementation of sound-based deterrents such as distress calls.
• Cultural practices like maintaining weed-free perimeters to reduce bird shelter availability.