And especially that water in bowls in your own backyard are great breeding grounds for the animal. Emptying the containers once every two weeks and covering a rain barrel well are the tips that Van Vliet can give to counteract the nuisance of the animal a bit. “You have to be sensible with mosquitoes and it is becoming more important, because of the West Nile virus, to do mosquito repellent. Make sure you have mosquito nets and screens,” said the biologist. “We really cause the greatest mosquito nuisance through our artificial water bowls. And yes, you can play an important role in that yourself.”