mosquitos

 The Asian tiger mosquito (Aedes albopictus) is an exotic species introduced to North America from Asia and has become a major pest and threat to public health in Maryland. This includes species adapted to breeding in swamps, ponds, sediment control areas, sewage lagoons and abandoned swimming pools. Hot summer temperatures help these mosquitoes proliferate and the deluge of rain from evening thunderstorms allows floodwater mosquito breeding in roadside ditches, containers, tree holes and lowlands. This results in swarms of mosquitoes. 

 It can take as little as a week for mosquitoes to complete their lifecycle.
Although it might seem like it, mosquitoes do not appear out of thin air. It takes a few days to a week for mosquitoes to complete their lifecycle from eggs to biting adults.
Mosquitoes are not all the same,
there are approximately 200 species of mosquitoes in the United States and approximately 50 species in Maryland. 

 Mosquitoes are most active in the spring: In Maryland, mosquito breeding takes place from the vernal equinox and extends slightly past the autumnal equinox into October. Most springtime mosquito breeding occurs in woodlands and adjacent swamps. Floodwater species dominate the landscape, their eggs flooded by snow melt and spring rains.