An invasion of barigüí, known as the 'black fly,' is affecting the Salado basin in Buenos Aires, raising concerns over its painful bites. These flies resist common repellents and breed in rivers and streams, worsened by recent rains and high temperatures. Authorities warn of potential severe skin reactions.
The Salado basin in Buenos Aires province is experiencing a massive invasion of barigüí, a type of black fly that bites and causes skin irritation. Recent reports indicate that this insect resists common repellents and reproduces rapidly in the area's rivers and streams, intensifying the issue over the past weeks.
Weather conditions have played a key role in this proliferation. Abundant rains combined with high temperatures have created an ideal environment for barigüí breeding, leading to a significant population increase. Residents near Buenos Aires have reported bites causing severe reactions, such as swelling and prolonged irritation, though no specific hospitalization cases are mentioned in initial reports.
Local experts attribute the phenomenon to seasonal changes but stress the need for preventive measures, such as using protection during outdoor activities. The alert was issued in the first days of January 2026, highlighting the urgency of monitoring the situation in this important agricultural and hydrological region. There are no signs of the problem spreading beyond the basin at present, but authorities recommend ongoing vigilance.
