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Occurrence on Heinrich-Heine-Straße and Bauhof – City reacts with immediate measures
Riedstadt. The invasive ant species Tapinoma magnum , also known as the large gland ant , has now been detected in Riedstadt . According to the city administration, the current occurrence is limited to a section of Heinrich-Heine-Straße (numbers 13–21) and the southern area of the municipal building yard .
Striking discovery during site inspection
At the beginning of July, members of the Environmental Department during an inspection as part of the "From Gray to Green" . The animals moved in dense columns between two field maples and were active right up into the treetops. Characteristics such as varying body sizes (2–4 mm), completely black coloration , and a pungent odor of acetone or gasoline pointed to the invasive species Tapinoma magnum . A specialist report confirmed the suspicion shortly afterwards.
Introduction probably via Mediterranean potted plants
According to the expert's assessment, the ant species was likely introduced via planters containing Mediterranean plants such as olive trees, citrus plants, or cherry laurel . From there, the insects apparently entered the tree-lined green strip along the road . The infestation at the construction yard is also likely related to a planter previously placed on Heinrich-Heine-Straße.
Immediate relocation and closure of the construction site
Due to the confirmed colonies, the construction project on Heinrich-Heine-Straße had to be stopped immediately and relocated Oppenheimer Straße Removal of the excavated soil is currently ruled out, as this would spread of the ants
Danger from supercolonies – control measures initiated
Tapinoma magnum is known for forming so-called supercolonies with millions of workers and multiple connected nests. According to experts, it is currently still possible to contain the spread in Riedstadt. The city of Riedstadt has therefore announced that a specialist company to control the populations in the near future.
It is important that the pesticides are used in a targeted manner so that native ant species , which also act as natural enemies of the invasive species, are not harmed .
Appeal to the population: No green waste in nature
In this context, the city highlights the dangers posed by improper disposal of green waste, plant debris, and excavated soil . These materials must not be disposed of in the open , as they may contain undetected queen ants or nests and thus contribute to the unwanted spread of ants .
(Riedstadt - Red/PSR)
Featured image: Tapinoma magnum workers on a gel bait. Photo: Dr. Martin Felke
