Unseasonably warm temperatures have led to an early surge of mosquito activity in Butte County, and similar patterns may impact Los Angeles County residents as temperatures continue to fluctuate. Mosquitoes that typically remain dormant during winter are becoming active earlier than expected, increasing the risk of mosquito-borne diseases like West Nile virus, Zika, and dengue.

Experts in Butte County report that once temperatures reach 65°F or higher, mosquitoes emerge from hibernation. While colder nights may push them back into dormancy, daytime activity can still pose a nuisance and a public health concern. The challenge for vector control agencies is that insecticide applications are typically not deployed until summer when mosquito populations are at their peak.

Los Angeles County residents should take proactive steps to reduce mosquito breeding by eliminating standing water around their homes. Birdbaths, clogged gutters, flowerpot saucers, and other small water sources create ideal mosquito breeding grounds. Preventative actions now can help control mosquito populations before peak season arrives.