Japanese skylark

The Japanese skylark (Alauda japonica) belongs to the order Passeriformes and the family Alaudidae. While often considered beneficial due to insect consumption, this species can become a significant agricultural pest when it congregates in large flocks on fields during the crop ripening stage.

These birds primarily target cereal and legume crops. Fields of wheat, barley, oats, and millet are at risk, particularly during the milk and dough stages of grain development, when the seeds are soft and highly nutritious, making them an attractive food source for avian populations.

The biology of this species is characterized by high daytime activity and a social structure that involves nesting in spring followed by the formation of large post-breeding flocks. These flocks utilize agricultural landscapes as their primary foraging grounds, often concentrating in high densities on maturing crops.

The damage is caused by the birds pecking at ears and panicles to extract the seeds. When localized in large numbers, Japanese skylarks can cause substantial yield losses, affecting both the quantity and quality of the harvest at the edges of fields and in large patches.

Effective management and protection measures include the following strategies:

• Deployment of bioacoustic devices that broadcast predator alarm calls.
• Installation of visual deterrents like motion-activated decoys and reflective materials.
• Use of propane cannons or other noise-generating equipment during peak vulnerability.
• Implementation of prompt harvest practices to reduce the duration the crop is exposed to birds.