Frequently Asked Questions

The dose makes the poison! The lethal dose depends on the amount of ingestion of the active substance in relation to the body weight. As a rule, however, secondary poisoning is only likely if a number of dead rats/mice are eaten in quick succession. However, there is no anticoagulant that can be called harmless in this context. The removal of dead harmful rodents is the be-all and end-all in the prevention of secondary poisoning.

Vitamin K

On the one hand, there are online overviews of recorded resistances (e.g. here: www.julius-kuehn.de). On the other hand, resistance can exist if baits are eaten but the infestation does not decrease. Rats are very cautious and do not change their food. Therefore, it is important to change baits only when no reduction of infestation is observed despite eating.

All 2nd generation formulations above 30 ppm, as well as difethialone and brodifacoum below 30 ppm are effective at single ingestion.

Basically dependent on the approval of the product, please be sure to observe the product label.

Equip entry routes with bait stations, clear away alternative food sources, cover access routes to buildings (cracks, crevices etc.) with rat foam.

There is currently no information on this.

Too many alternative food sources that taste better; wrong placement of bait boxes; bait is no longer fresh. Rats are very cautious, it may take them a while to get used to the bait.

An increased incidence is to be expected in the cold months with little natural food supply. Attentive monitoring throughout the year, e.g. with baits without active substances, prevents a surprising, massive infestation.

The toxicity and thus the effectiveness is higher with 2nd generation agents. In addition, there are more resistance areas with 1st generation active substances due to the one-sided and long-term application.

In any case, observe the animal to see if it is reluctant to eat or move. To be on the safe side, consult a veterinarian and take the product label with you.

100 g of maize contain 40 micrograms of vitamin K. Rodents would have to ingest a huge amount of maize to get 5 mg of vitamin K. This will usually not be possible and therefore maize has no effect unless the rodents are resistant to the active ingredient used.

Rats: depending on region/location (current resistance maps: https://guide.rrac.info/de/resistenzkarten.html).
Mice: if no lasting change in infestation is observed upon acceptance from the bait.

Yes, professional users are subject to a documentation obligation when using rodenticides. The documentation must in any case show the location, the target, the biocidal products used (product and quantity) and the persons carrying out the pest control. The documentation must be kept for at least 5 years.