Japanese grosbeak

Systematic position: The Japanese grosbeak (Eophona personata) belongs to the order Passeriformes and the family Fringillidae. It is a large finch native to East Asia, known for its massive, powerful bill which is perfectly adapted for cracking hard seeds, but unfortunately also for destroying fruit buds.

Crops and damage: The bird primarily affects fruit-bearing trees, particularly those in the Rosaceae family. Orchards of apples, pears, cherries, and plums are most susceptible. The damage is most acute during late winter and early spring, a period known as the "hunger gap" for birds when natural food resources are scarce.

Biology and life cycle: The species inhabits broad-leaved and mixed forests. During the breeding season, their diet shifts heavily toward invertebrates, which benefits the forest ecosystem. However, they are highly adaptable, and when natural food sources are depleted or covered by snow, they aggregate and frequent orchards to feed on tree buds.

Impact on agriculture: The feeding activity of these birds is highly destructive to orchard yields. By consuming the flower buds, the Japanese grosbeak directly prevents fruit set, which can lead to significant economic losses for fruit growers. In cases of high bird density, extensive feeding can also cause branch dieback and stunt the development of young fruit trees.

Protection measures: Managing the impact of the Japanese grosbeak requires humane exclusion and deterrent strategies:

• Applying reflective tape or spinning holographic discs to deter birds through visual disturbance.
• Installing sonic bird repellers that broadcast distress or predator calls.
• Covering small trees or specific branches with protective bird netting during the early spring bud-burst phase.
• Providing alternative food sources (bird tables) away from the main planting rows to divert bird traffic.