FAQ | General Information


Questions & Answers about general information

Primary/secondary poisoning in dogs, cats, birds - what is the risk?

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.

Is there an antidote for rodenticides?

Vitamin K

How do I know if there is resistance?

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.

Single-feed or multi-dose?

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

Where can I use rodenticides as a farmer?

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

How do I best control rodents in an open stable, next to many fields?

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

Are new active substances to be expected?

There is currently no information on this.

Sale and use in Belgium and Luxembourg - what is the legal situation?

The existing authorisations require an extension to the countries in question. Which application and dispensing is then permissible in these markets can only be determined after approval has been granted.

What mistake am I making if I definitely have a rat infestation but the baits are not being eaten?

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.

At what time of the year is it most sensible to control them?

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.

What is the difference between 1st and 2nd generation agents?

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.

What should I do if my dog/cat has eaten a bait or a rat has eaten the rat bait?

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.

Is it true that maize neutralises the effect of rat medication?

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.

There was an article in the agricultural weekly about a new active substance (cholecalciferol) from Bayer. Is this available for purchase?

Inclusion in the Kerbl range is currently being examined.

Are there any concrete guidelines on how §9 should be implemented in practice at the trader's premises?

Unfortunately, these concrete specifications do not exist! However, Kerbl is available with advice and support to work out practicable and safe solutions together.

Do you offer certificates of competence or is a farmer automatically competent?

Kerbl does not offer any expert training. A farmer is considered to be competent, as he has usually completed at least one of the courses on plant protection or animal husbandry in order to be able to carry out his work.

Is there a 100% legally secure solution for online trading?

Yes, these are available, and we will be happy to advise you individually on this: 08086/933-554 or schaedlingsbekaempfung@kerbl.com

How can one determine whether resistance is present?

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.

What is the Stop-Feeding Effect | Advantages/Disadvantages?

A feeding stop already occurs after 2-3 days, resulting in the following advantages:
- a significant saving in bait material
- the cessation of the intake of alternative foods
In order to achieve this stop-feeding effect, however, special care must be taken with the initial baiting. It is crucial to provide sufficient bait, otherwise control can only take place again after approx. 14 days.