Red ants in my lawn

Garden Experts
We have a lawn area of 4 m x 3 m in size, half of which lies in the shade. Since the beginning of this year, I have determined that the ant population on the lawn has increased massively in size, and I don't know how to regain control of the situation. I have already used a little baking powder on the border stones, which achieved minor success last year, but how should I proceed on the lawn? Because we have only rented the house we live in, I cannot use anything particularly aggressive; the lawn area is bordered by Japanese cypresses which already look as though they are about to die. I don't know whether the ants have anything to do with that. Since we have children, I don't want them to be afraid when moving freely over the lawn. The ants in question are red ants. I hope that you might be able to assist me with this problem.

The GARDENA gardening expert

Dear Ms. R.-W., these are lawn ants (Tetramorium caespitum), and can become extremely annoying, in view of the fact that you can have as many as 80,000 ants in one colony. They can be effectively combatted with a combination of insect spray and insectcide bait such as Blattanex Ameisenmittel (Anti-ant agent), David Ameisenfrei (Ant-free agent) or Loxiran® -S- AmeisenMittel; these are all so-called “sprinkle and pouring agents”. 

Purely ingestive poisons (without the use of sprays) would be preparations such as Aeroxon Ameisen-Köderdose (Ant bait tin), Blattanex Ameisenköderdose, Delicia Ameisen-Köder (Ant bait), Detia® Ameisen Köder, Detia Ungeziefer Köderdose (Vermin bait) NEW, Fourmidor®, and Loxiran® AmeisenKöderdose. 

It is best if you obtain advice on the abovementioned preparations from a plant protection consultant in a garden centre. According to my knowledge, all of these are currently authorised for use in home gardens and small gardens.