The Asian tiger mosquito (Aedes albopictus) was first introduced into Vienna in 2020 in the southeastern green belt along the main traffic routes. The tiger mosquitoes overwintered there and occasionally spread further into adjacent residential areas and garden settlements. The tiger mosquito has also been spotted at inner-city long-distance bus stops in recent years. The tiger mosquito is on its way into the city: on the one hand, travel and long-distance traffic encourage the ongoing introduction of new mosquitoes. On the other hand, established tiger mosquitoes are adapting better and better to the weather conditions - including milder winters. The further spread of the tiger mosquito should be prevented, as it also bites during the day and can also transmit diseases when it bites. The most effective and safest countermeasure is to consistently avoid water accumulation in the home and garden and to protect yourself from bites by wearing suitable clothing and insect repellent (repellents). Why should we stop the further spread of the tiger mosquito? The day-active tiger mosquito can be very annoying and can also transmit pathogens such as the West Nile virus. We must therefore all stop their permanent settlement and rapid reproduction early on by consistently avoiding breeding grounds in our homes and gardens. The larger the tiger mosquito population becomes, the more difficult it is to contain it. Tiger mosquito eggs only need small amounts of moisture to survive: when gardening, on terraces or balconies, remember to dry out breeding grounds (possibly with eggs) and not to create new breeding grounds. Vessels and containers such as pot stands and birdbaths should be emptied and wiped dry if possible. When storing, remember to turn containers, garden furniture, wheelbarrows or similar over. Do not pour the contents into the drain, but empty them on the lawn.