The invasive species Halyomorpha halys, commonly known as the brown marmorated stink bug, has become increasingly prevalent in recent years in agricultural areas and residential zones across Türkiye. This year, its population has reached its peak.

While biological control efforts continue against this pest, which damages many agricultural products—particularly hazelnuts—experts are emphasizing the importance of the spring season. According to specialists, the bug cannot withstand cold temperatures and thus mostly dies off naturally during the winter. However, individuals that emerge from overwintering shelters in March and April pose a serious threat for the new season.

"At this stage, there is no chance of eradicating this insect"

Prof. Dr. İslam Saruhan, a faculty member of the Plant Protection Department at Ondokuz Mayıs University (OMU) Faculty of Agriculture, explained the reasons behind the recent increase in sightings of this pest, known colloquially as the brown marmorated stink bug. He noted that it has been approximately six years since the bug was first introduced to Türkiye, and its population has now reached a peak. Stressing that there is no need for panic, Saruhan stated:

“The brown marmorated stink bug is an invasive species that multiplies rapidly in countries it enters. Due to its high reproductive capacity and unique behavior, it is nearly impossible to completely eradicate it once introduced. However, with the right methods, we can protect our crops.”

“Samurai wasps are being released into the environment”

Prof. Dr. Saruhan explained that as part of the biological control measures against the brown marmorated stink bug, production of the samurai wasp is underway and that these beneficial insects are being released into nature:

“The samurai wasp parasitizes the eggs of the brown marmorated stink bug, preventing its reproduction. As this wasp population increases in the wild, the stink bug population will gradually decline.”

"The United States has been combating it for 35 years"

Emphasizing that the United States has been battling this pest for 35 years, Saruhan continued:

“Currently, the U.S. is focused on preventing the bug from entering overwintering shelters, as it cannot survive cold temperatures. Those that remain outdoors during winter perish. Therefore, it is crucial to prevent them from entering shelters and homes. Entry points should be sealed, and proper insulation ensured.”

“Winter spraying is not recommended”

Saruhan pointed out that chemical spraying during winter is ineffective:

“Research shows that 50–80% of bugs entering winter shelters die off naturally. There is no need to intervene with bugs that are already going to die. Our primary focus should be on those emerging from dormancy in March and April.”

“The bugs entering homes are harmless”

Saruhan also addressed a common public misconception:
 
“The brown marmorated stink bugs that enter homes do not pose any harm to humans, pets, or household items. They do not bite and do not transmit disease. However, eliminating them indoors can contribute to reducing their overall population.”

Prof. Dr. İslam Saruhan concluded by emphasizing the importance of public awareness and highlighted that this pest can be controlled through biological methods without disrupting the natural balance.