Mosquito populations booming after recent Texas rains

That familiar buzz and bite are signs that mosquito season in Texas is here, according to a Texas A&M AgriLife entomologist.

Sonja Swiger, Ph.D., Texas A&M AgriLife Extension Service entomologist and associate professor in the College of Agriculture and Life Sciences Department of Entomology, Stephenville, said biting mosquitoes are a seasons-long problem that often changes based on the environment.

Which species are present and whether mosquitoes are an annoyance or vectors for diseases likely depends on those conditions, she said. Similarly, the temperature, availability of water and type of water available, such as clear floodwater in ditches, a wheelbarrow that has collected water or stagnant puddles in hot, dry weather are all contributing factors to what type of mosquito is visiting you and your family.

The annual mosquito boom

Rainfall, especially with multiple storm systems that have saturated and flooded areas around the state, can significantly contribute to a boom in mosquito populations, Swiger said. 

“People are seeing, and should expect to see, quite a bit more mosquito activity in the next days and weeks,” she said. “Our focus is going to be disease carriers that typically become a problem in late summer and early fall. However, all this rain has created plenty of habitat for floodwater and container species.”

Swiger divides mosquitoes into those three categories – floodwater, container and stagnant – and they typically emerge in the order related to the breeding environment they prefer.

“Mosquitoes come in waves and can overlap as the season progresses,” she said. “It can help to understand what type you are dealing with, how to do your part to control them around your home and how to protect yourself and your family because we are in mosquito season.”

First wave: floodwater mosquitoes

Floodwater mosquitoes are the first to emerge after rain events, Swiger said.

Heavy rains leave the ground saturated and create standing puddles in ditches and low spots in fields and lawns. Floodwater mosquito larvae emerge quickly after water becomes available. Eggs are placed there by females and wait for water, sometimes two to five years before rainfall reaches them depending on the species, Swiger said.

Floodwater mosquitoes are typically larger and are aggressive. These types of mosquitos are often the persistent biters from dawn to dusk, Swiger said.

“The potential for standing water could make their habitat more widespread, which will make them a greater issue for more people than normal,” she said. “Any location that is holding water, even in grassy areas, could be a breeding ground.”

Swiger said females lay more eggs in the moist soil around puddles, and either more larvae emerge, or they will go dormant and wait for water to return. Subsequent rains can wash larvae downstream but can also trigger dormant mosquito eggs.

Second wave: container mosquitoes

Container mosquitoes, which include the Aedes species identified by its black and white body and white striped legs, typically emerge next. Female mosquitoes lay eggs in anything holding water – from tires, buckets and wheelbarrows to gutters, unkept pools and trash cans. They prefer clearer, fresher water, and females are constantly looking for good breeding sites.

Container mosquitoes like Aedes are daytime feeders but can be opportunistic at nighttime when large groups of people gather, Swiger said.

“Anytime after a rain, it is good to make a round on the property to look for anything that might be holding water,” she said. “It just takes a matter of days for these mosquitoes to go from egg to biter, so they can become a problem pretty quickly.”

Third wave: Culex 

mosquitoes

Culex, a mosquito species that prefers stagnant pools of water with high bacteria content, typically emerge as waters recede and dry summer conditions set in and create breeding sites in low-lying areas. They are the disease carriers that concern the public and health officials, Swiger said.

It is not easy to forecast their emergence because their ideal environment can be washed away by additional rains or dried up by extreme heat and drought, Swiger said. In rural areas, bogs, pooled creek beds or standing water in large containers such as barrels, trash cans or wheelbarrows can make a good habitat for Culex. In the city, similar pools in dried