Spraying Alone Is Not Enough to Control Mosquitoes – A New Guidance Booklet from the HUN-REN Centre for Ecological Research Proposes a New Approach

The nuisance caused by mosquitoes, and efforts to control them, are by no means new. However, addressing current global mosquito-related challenges requires a new approach. To support this shift, the HUN-REN Centre for Ecological Research has published a guidance booklet entitled Mosquito Control on Ecological Foundations: An Integrated Approach. The publication presents the current situation of mosquito control in Hungary and outlines modern, environmentally responsible control options, while paying particular attention to emerging challenges, including the appearance of invasive mosquito species and the growing risk of mosquito-borne diseases. It offers a policy-oriented framework that may help to rethink the aims, tools and decision-making mechanisms of mosquito control. A central emphasis is placed on data-driven decision-making, that is, the regular monitoring of mosquito populations, breeding sites, environmental factors, pathogens and any potential resistance to insecticides. Comprehensive data collection makes it possible to ensure that interventions are carried out not on the basis of routine, but on the basis of actual risks that are adjusted along the needs of the involved society. The guidance booklet also gives particular prominence to the ‘One Health’ approach, which treats human, animal and environmental health as a single interconnected system and provides a basis for the development of effective control strategies.

In Hungary, mosquito control has for many decades focused primarily on the rapid reduction of mosquito nuisance to the public, mainly through chemical interventions targeting adult mosquitoes. Although these methods may reduce nuisance in the short term, on their own they do not provide, in the long term, an adequate response to the new societal, ecological and public health challenges that have become increasingly pronounced in recent years. Among the most important of these challenges is the emergence and spread of invasive mosquito species. The Asian tiger mosquito, the Japanese bush mosquito, and the Korean bush mosquito may appear in inhabited areas not only as troublesome biting insects, often active during the daytime, but also as potential vectors involved in the transmission of various pathogens. For this reason, strengthening public health preparedness is becoming increasingly important, at the same time as public demand is growing for reduced chemical use and for more sustainable methods to be given greater priority.

One of the publication’s main messages is that mosquito control requires both a conceptual and a practical shift. The future does not lie in the exclusive use of any single method, but in the development of a complex, adaptive system grounded in ecological principles. This integrated approach takes into account local conditions, the biology of mosquito species, the characteristics of breeding sites, the epidemiological situation, nature conservation considerations and public expectations. Although chemical control may provide a rapid means of intervention, its effects are short-lived and it is not specific to mosquitoes, meaning that non-target insects, including pollinators, may also be affected. Chemical treatment should therefore be considered only where justified, and applied in a targeted and carefully planned manner. Biological larval control, for example Bti-based treatment (that is, the biological control of mosquito larvae using a bacterium-based preparation), may offer a more targeted and environmentally sustainable solution, especially when it is based on appropriate habitat mapping, professional planning and post-intervention monitoring. In the case of invasive species, however, this method alone is not sufficient in every situation, as they often develop in small, difficult-to-map water collections around homes, where large-scale Bti-based treatments cannot be applied.

The publication is intended not only for specialists but also for the wider public, because sustainable mosquito control is a shared responsibility. Eliminating standing water around the home, covering rainwater collectors, clearing blocked gutters, and regularly treating water accumulating in plant pots, buckets, bird baths or paddling pools are all simple measures that can effectively reduce mosquito breeding. Public participation is particularly important because invasive mosquito species often find breeding sites precisely in the immediate human environment — sites that are difficult to manage through centralised mosquito control programmes.

The aim of the publication is to build a bridge between scientific findings and practical decision-making. It seeks to provide guidance on how to strike a balance between public comfort, public health safety, and nature conservation and environmental protection considerations. It is essential to recognise that effective and sustainable mosquito control is a shared responsibility in which researchers, decision-makers, local authorities and the public all have a role to play.

The booklet is available HERE (in Hungarian).