21 May 2019

Ask the technical team May 2019

Technical | PPC95 May 2019

Rodenticide confusion, open trays, resistance searches and invasive hornet questions are all in the BPCA Technical team inbox this issue.

When you’re a BPCA member you can get technical support whenever you need it via our experienced technical team. Here are just a few of the latest questions posed...


  • You can’t use multiple rodenticides in a single bait station
  • Open tray use is all about the labelling
  • You can search for rodenticides resistance issues on the RACC interactive tool
  • All sightings of Asian hornets should be reported to the Non-native Species Secretariat.

Ask the technical team anything

Can I use two different rodenticide products in one tamper proof bait station?

DEE REPLIES: A popular question which has three main (albeit convoluted) answers but, in short, no.

Product label – the way the label describes how to administer the rodenticide (directions of use) does not mention it is okay to ‘mix’ different products in the same box so it could be a problem
A label usually describes specifically the application rate. Different products may have different application rates and recommendation and so mixing products may not fully comply with the label of each product in terms of application.

In terms of reporting and marking where and what is in your toxic baiting points (on customers sites), if there are two different products/actives in the box then it is difficult to properly report on this without confusion. How do we track which has what and in what boxes (try saying that out loud three times fast)? If two different actives are in one box, how would an untrained eye know which is which in the case of an emergency? Or audit?

What’s the word on open trays?

NATALIE REPLIES: Open trays are only legal when the rodenticide used has a label stating that it suitable for open tray use. Also check the specification you are working under as some sites have policies for open bait in trays. For example, food production areas may not be authorised in site policies for open bait tray use.

Additionally, a tray or a box it has to be labelled with identification if the product label makes this a condition of use.

As you know, labels are constantly changing and rewording phrases so keeping an eye on them is important.

How do I find out if I have a resistant population of rodents?

NATALIE REPLIES: The Rodenticide Resistance Action Committee (RRAC) provides this service with the help of the Vertebrate Pests Unit (VPU) team at the University of Reading, UK.

With this information, RRAC has created and will continue to update a freely-accessible interactive mapping tool so that pest control operators can get information on what types of resistance are in their area, and guidance on which anticoagulants will prove most effective guide.rrac.info/resistance-maps/united-kingdom

The University of Reading is collecting rat and mouse tails for resistance testing. For guidance on how to send samples visit research.reading.ac.uk/resistant-rats/rat-resistance-testing/


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01332 294 288

Source: PPC95