BEAUMONT, Texas — It's the itchy and sometimes painful reality following a flood -- an explosion of blood sucking mosquitoes. 

Swarms of the insects are now invading Southeast Texas following the devastating flooding brought by Tropical Storm Imelda. 

Mosquito problems occur in two distinct waves after a flood, according to Texas A&M's Disaster Education Network

The first mosquitoes to arrive are the flood water mosquitoes. These are salt marsh and pastureland mosquitoes that lay their eggs on the soil in areas that often seen high water after a heavy rain. These are typically nuisance mosquitoes whose eggs hatch five to seven days after a flood. 

"Sometimes they're bigger than a quarter, literally," Beverly Northern of LaBelle said. "That's why we call then 'swamp turkeys' out here."

According to the CDC, nuisance mosquitoes do not spread viruses that make people sick. The types of mosquitoes that can spread viruses may increase 2 weeks to 2 months after a hurricane, the CDC says

RELATED: Jefferson County mounts massive spraying effort to fight mosquitoes after Imelda

RELATED: Why do some people get bit by mosquitoes more than others?

Southeast Texas is now entering phase two of the mosquito invasion. After flood water recede and the nuisance mosquitoes disperse, they begin laying eggs in calm pools of standing water. 

Many of the mosquitoes that carry disease in Texas come from these eggs, Texas A&M's AgriLIFE EXTENSION says. These mosquitoes can carry and transmit West Nile virus and St. Louis encephalitis. 

Jefferson County Mosquito Control has mounted a massive spraying effort. 

"Please be patient. We know that we have a problem out there, and we are on top of it," Jefferson Co. Mosquito Control director Kevin Sexton said.

They have trucks in south Beaumont and will have planes spraying Monday in Pine Island, Meeker, Nome and Old Nome Road area. On Tuesday the plane will go to Windshire, Green Thumb and Big Hill area of Beaumont. 

Orange County Mosquito Control sprayed Sunday in the south/southeast portion of the county. They will spray Monday night based on surveillance data of mosquito concentrations.