Small black flies with a wicked bite are swarming parts of the San Gabriel Valley, and experts say their unusual early arrival is overwhelming residents. Experts describe the insects as smaller than mosquitoes but far more aggressive. They aim for the eyes, and their bite is painful. Unlike common houseflies, black flies are drawn to human breath and the salty moisture around the eyes. Vector control technicians are targeting black fly larvae in local riverbeds, where the flies thrive in fast-moving water. What stands out this season is the timing. Typically, black flies appear in May, with another surge in August, but their presence in late March is raising concerns. Black flies can travel up to 5 miles and live for as long as a couple of months. To avoid bites, experts recommend wearing DEET-based insect repellent and using a hat with a face net. Homeowners with water features are advised to turn them off for 24 hours once a week to disrupt any potential breeding.
