Ortolan bunting

The Ortolan bunting (Latin: Emberiza hortulana) is a small passerine bird in the bunting family Emberizidae. While it is a species of interest to ornithologists, in agricultural landscapes, it can behave as a pest during the harvest season. These birds are known for their preference for open agricultural habitats, which brings them into direct conflict with crop production.

The biology of the Ortolan bunting is centered on seasonal migration and nesting in ground-level vegetation. They prefer nesting in areas with abundant cover, often found at the edges of crop fields or near uncultivated borders. This proximity to the source of food allows them to maximize their intake of cereal grains, especially when the crop is reaching the milk and dough stages of development.

Agricultural crops damaged by these birds include cereals such as wheat, oats, and millet, as well as sunflowers. By feeding on the grain, they reduce the yield and the overall quality of the harvest. Furthermore, during the early growth stages, they may uproot or eat newly sprouted seedlings, forcing farmers to re-sow damaged areas, which leads to additional labor and seed costs.

The level of damage is typically correlated with the bird's population density in the immediate vicinity of the field. The harm is visible through partially stripped heads of grain and damaged flower heads in sunflower crops. Farmers often observe these birds congregating in large groups near forest belts, which serve as both a nesting site and a base for foraging operations throughout the day.

To mitigate the impact of the Ortolan bunting, effective integrated pest management strategies should be implemented:

• Deploying bio-acoustic devices that broadcast predator distress calls to deter birds.
• Utilizing visual deterrents such as reflective tape or bird-of-prey silhouettes.
• Optimizing harvesting schedules to ensure grain is removed from fields as soon as it reaches maturity.
• Managing field borders and removing dense weeds to limit nesting opportunities near valuable crops.