Human has been successful in the eradication of species as the moa or the dront. The war against mosquitoes started in the beginning of the 20th century and more effort has been put in it than in any other eradication project. Still it has not been very effective. Sardinia was practically covered with DDT after WWII, but it is not unusual to stumble on Anopheles labranchiae there again.
Lena Hulden's blog
This season I have together with my husband been monitoring bloodsucking insects at the reindeer research station in Kaamanen, Lapland Finland (69˚ N lat.). The station is about 150 km from Barents Sea and the snow smelts in late May. The ground is frozen from October/November until May/June and the depth of the frost is 80 cm. The staff at the station is really friendly and helpful.