The local mosquito and vector control district has initiated larvicide treatments in breeding grounds, although it warns that a noticeable decrease in the pest population will take weeks due to the current magnitude of their numbers. Unlike other insects, female black flies have scissor-like mouthparts that cut the skin to draw blood, which is necessary for their reproductive cycle. This phenomenon responds to a combination of environmental factors. Rising temperatures and higher water flow in rivers and streams have created the ideal scenario for the reproduction of these specimens, also known as 'buffalo gnats.' The Ministry of Public Health clarified that the black fly is not new to the region and has already been in Uruguay. Although they do not transmit fatal diseases, their bites cause severe inflammation, intense itching, and redness. An invasion of black flies is generating growing concern in Southern California, particularly in the San Gabriel Valley. Residents of localities such as Altadena, Azusa, Glendora, and Monrovia report an unusually high activity of these insects, whose bites are painful and alarmingly concentrate around the eyes, head, and neck. To avoid becoming a target, health authorities recommend paying special attention to clothing. These insects are particularly attracted to dark colors such as blue, black, red, and dark green. Other protective measures include avoiding staying near bodies of flowing water during peak activity hours. Using repellents approved by health agencies. Installing protective screens on doors and windows to prevent entry into homes. Care after a bite In case of a bite, the portal Very Well Health advises washing the affected area immediately with water and soap. The application of cold compresses helps reduce inflammation, while avoiding scratching is vital to not developing secondary infections. If symptoms persist or worsen, the general recommendation is to seek professional medical attention. The presence of this pest has altered daily life in parks, schools, and recreational areas, where attendance has decreased drastically. For this reason, wearing light-colored clothing is fundamental to reduce the risk.
