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Chris P
Starting Member
United Kingdom
8 Posts |
 Posted - 10 Apr 2009 : 09:39:58
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| I have a few sites in the same area and am finding that mice appear to be resistant to contrac blocs (bromodiolone), they just powder down the blocks and eat the grain within. I have changed baits to the difenacoum pasta sachets and am having more success - just wondered if anyone else has had the same issue? |
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The Spotlight Kid
Moderator
1407 Posts |
Posted - 10 Apr 2009 : 18:53:27
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| I'm sure you know your mice Chris but slugs will eat the block and leave the seeds. Are the slugs beating the mice to the blocks leaving the mice with insufficient bait? Just a thought. |
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Chris P
Starting Member
United Kingdom
8 Posts |
Posted - 15 Apr 2009 : 20:36:45
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| This isn't slugs, mice are doing this |
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The Spotlight Kid
Moderator
1407 Posts |
Posted - 15 Apr 2009 : 22:13:53
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Sorry Chris, I totally misread your post. You said they eat the grain wheras slugs leave the grain.
In that case give them a Bromadiolone grain bait and see what happens. |
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PelGar
Starting Member
United Kingdom
7 Posts |
Posted - 16 Apr 2009 : 17:26:06
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Stick with the difenacoum, it is twice as effective against mice and less toxic to non-targets!
PelGar International 'Leading the way in global pest control' |
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Tomo
Senior Member
United Kingdom
221 Posts |
Posted - 17 Apr 2009 : 09:18:05
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Is this a fact that difenacoum is twice as toxic to mice?
I find this interesting as bromadiolone has a higher LD, why then more toxic to mice?
Why specifically mice and not to rats?
And why less toxic to non target species?
I cant help but think all this info seems to contradict each other, I am not trying to be awkward (it comes naturally)but could you please expand on this as I find this really interesting.
Regard's Tomo |
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The Spotlight Kid
Moderator
1407 Posts |
Posted - 17 Apr 2009 : 09:52:09
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I agree Wayne there are a lot of inconsistencies concerning AC poisoning and resistance. The reasons I suggested to Chris a Bromadiolone based wheat bait (after reading his post properly) was this;
His mice were only eating the grain and not the block.
He was suggesting resistance to Bromadiolone.
Therefore using a Bromadiolone wheat based formulation should be palatable enough to get them eating all the bait and this would in turn prove whether they were resisitant to the AI too.
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PelGar
Starting Member
United Kingdom
7 Posts |
Posted - 24 Apr 2009 : 10:18:30
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Hi Tommo et al, just to clarify the point i was making before with regard difenacoum/bromadiolone and mice/non-targets.
In general the LD50 for a 25g mouse feeding on bromadiolone is 0.9g, compared to difenacoum at a rate of 0.4g, meaning a mouse will have to feed on less than half the amount. This alone wil have a tendency to reduce non-target risk, i.e. consuming a lethal dose in a shorter time.
Another point to make, and an advantage of using pasta bait or cut wheat for mice, is that mice have a tendency to kibble whole grain bais, peeling off the treated outer surface and only eating the inside, increasing the amount they will need to eat in order to consume a lethal dose.
On the toxicity to non-target species front - as an example the lethal does for a dog is:
Bromadiolone - 200g/kg body weight.
Difenacoum - 1000g/kg body weight.
Brodifacoum - 5g/kg body weight.
Although anticoagulants essentially work in the same way - there are certain differences which affect their toxicity to different animals.
I have a table which we have compiled from a variety of industry sources which highlights the different toxicity levels of these actives and others - if you would like a copy please e-mail me on [email protected] and i'll send something over to you / happily discuss in more detail.
Just to make one final point. With the above figures for a dog - these are based on lab tests, and some species/animals may be more suceptable than others. These figures indicate the relative toxicity between actives, but in any case of non-target poisoning, provide the information of active etc and always recommend a visit to the vets and let them make the decission.
I hope this information is of use to you all - a lot of this is contained in PelGar's new product catalogue which we will be happy to send out if you wish to e-mail me (please note - i am not trying to advertise here, we do not sell direct to PCO's - just trying to be helpful).
Best regards.
PelGar International 'Leading the way in global pest control' |
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nigel
Hyperactive Member
786 Posts |
Posted - 25 Apr 2009 : 07:10:41
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Your choice of bait can speak volumes about how much you are in control of what you do.
quote:
Another point to make, and an advantage of using pasta bait or cut wheat for mice, is that mice have a tendency to kibble whole grain bais, peeling off the treated outer surface and only eating the inside, increasing the amount they will need to eat in order to consume a lethal dose.
Mice also will translocate large particle baits for consumption later increasing the risk to non target animals, so too will using flavoured baits outdoors. |
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The Spotlight Kid
Moderator
1407 Posts |
Posted - 25 Apr 2009 : 14:34:59
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| For mice I always use cut-wheat or blocks in boxes. |
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Topic |
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Contrac Blocs - Bromodiolone - Resitance
