Graz starts fight against tiger mosquitoes: 600,000 sterile males in use!

Graz starts fight against tiger mosquitoes: 600,000 sterile males in use!

Graz, Österreich - In Graz, an innovative pilot project starts combating the Asian tiger mosquito. In the next six weeks, around 600,000 sterile males of this species will be released in order to significantly reduce the population of this disease -transmitting insects. The initiative is carried out in cooperation with the research institution of the International Atomic Energy Organization (IAEA) in Seibersdorf, which is responsible for breeding and sterilization of the mosquitoes.

Hanano Yamada, a scientist of the project, explains the complex process that begins with the rearing of the mosquitoes in large shells. In the puppet stage, the males are sterilized in a cold room by treating them with an X -ray device. After 24 hours, the irradiated mosquitoes are exposed to nature. This method, known as sterile insect technology (SIT), has already been successfully used in Italy and Florida.

background and goals of the project

The Asian tiger mosquito, which was first detected in Graz in 2021, can transmit over 20 different pathogens such as dengue, zika and chikungunya viruses. In view of these health risks, the city of Graz plans to reduce the mosquito population by 70 percent. Eva Winter, head of the Graz Health Office, emphasizes the urgency of the project, since this mosquito species is increasingly widespread in northern regions, not least because of global warming. The population is also asked to avoid standing water points in order to prevent the female mosquitoes.

The project takes place in a 15 -hectare observation area in the Schönau home garden. In addition, another area in the west of Graz is used for monitoring purposes. In order to follow the course of the project, around 50 insect and egg traps are set up, and the mosquitoes are released in tranches with color markings. Data on the results are evaluated after the project is completed in October.

The effectiveness of sterile insect technology

Sterile insect technology offers a sustainable alternative to chemical insecticides and aims to reduce the number of offspring through the release of sterile males that mate with fertile females. This approach has already shown success in several countries, including fighting the dengue fever in Tahiti. The SIT has the advantage that it does not leave chemical residues in the environment and thus represents an environmentally friendly approach to insect control.

Erwin Wieser, head of strategic insect protection, warns that the Asian tiger mosquito may not be completely eliminated, and indicates that the population should continue to take measures to avoid open water points. If it is successful, the pilot project in Graz could be extended to other areas next year to protect the health of the citizens.

For more information about the sterile-insect technology (SIT), your application and success you can read the articles on Ö3 and Bioprotection Portal .