Mexican duck

The Mexican duck (Anas diazi) belongs to the order Anseriformes and the family Anatidae. While ecologically important, this waterfowl species is recognized in agricultural contexts as a pest capable of causing significant economic losses to cereal crops, particularly in regions where intensive farming intersects with the habitat of wild aquatic birds.

This species primarily targets cereal crops such as wheat, barley, and corn. During the early developmental stages of these crops, the birds feed on tender shoots and emerging seeds. Their proximity to irrigation ditches and water reservoirs makes agricultural fields highly attractive, leading to intensive grazing that can occur throughout the day, especially during dawn and dusk.

The life cycle of the Mexican duck is influenced by seasonal water availability and nesting periods. After nesting in riparian vegetation, the ducks move their broods to agricultural landscapes rich in food sources. As the young birds grow, the total biomass consumed by the flock increases, leading to a spike in agricultural pressure during critical phases of plant development.

The primary form of damage is the direct consumption of young seedlings and the trampling of soil around the plants. This results in reduced plant density, uneven crop stands, and significant yield losses. Furthermore, the birds often congregate in large groups, which amplifies the localized impact on specific areas of the field, leading to severe spot-damage.

Effective protection measures require a multi-faceted approach. Farmers typically employ a combination of non-lethal methods:

• Deploying propane cannons or electronic acoustic deterrents.
• Using visual scarers like raptor silhouettes or reflective streamers.
• Applying bird-repellent seed treatments that affect the taste or smell of the seedlings.
• Implementing buffer zones and physical barriers such as fencing in high-risk areas near wetlands.