Non-native Argentine ant populations have exploded around the state in the past century. Here's what to do if they invade your house. Block entryways into your home with caulk and petroleum jelly. Sponge up ants with soapy water. Clean surfaces of food and garbage. Remove infested potted plants and check new landscaping materials for ants. Use baits to control the colony.
Argentine ant facts Common name: Argentine ant Scientific name: Linepithema humile Origin: Argentina, but they're now found on every continent except Antarctica. Appearance: Workers are dull brown, 1/8-inch long and travel in large numbers. Home base: Nests teem with millions of workers and multiple queens. They live in a cluster of shallow nests in the ground that are connected by trails. Behavior: Large numbers of ants move in long trails in search of sweets. They eat sugary fluids produced by such insects as aphids. They're known to invade homes. Impact: The invaders have spurred declines in native ants and lizards throughout the state.
Source: University of California