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PostPosted: Mon Nov 05, 2012 12:00 pm 
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Dapper Duck
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Location: Ipswich, Queensland
I got some permethrin solution that is 40g/l - how much should I dilute it to spray the coop and pen? It's sold as a treatment for dogs and horses, according to the label.


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PostPosted: Mon Nov 05, 2012 12:09 pm 
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Golden Kingfisher
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No, nostress suggested the following....
nostress wrote:
Its concentration is 100 g Permethrin/l. Use 5 ml of this stuff per 1 liter of water

and yours is:

Serenia wrote:
I got some permethrin solution that is 40g/l

Now, trying to get my maths brain on.....

Nostress's solution: 5ml of 100g/L = 0.5g of Permethrin that is then added to a litre of water. So that is what we are after.

So, to get 0.5g per litre you need to dilute yours so it is 1/80th as strong. So, take 12.5ml of your solution and add it to a litre of water and you should be right.

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PostPosted: Mon Nov 05, 2012 1:19 pm 
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Dapper Duck
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Thankyou! My maths brain is hopeless. I'm a bit scared about my chemistry courses when I start my degree next year!


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PostPosted: Mon Nov 05, 2012 1:24 pm 
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Golden Kingfisher
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Don't worry, when I said 'putting on my maths brain' I was kinda being sarcastic, 'cause I don't usually do numbers :lol:

I think I got it right though :think: :)

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PostPosted: Mon Nov 05, 2012 4:11 pm 
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Dapper Duck
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Location: Ipswich, Queensland
Alright! Coop cleaned - I scrubbed and hosed it out, disposed of the bedding, and watered the whole pen and coop with the diluted permethrin solution. I even bathed the chooks, who were not impressed, although they didn't freak out too much. Plenty of sun for them to dry in today.

Once everything is dry, I'll put the coop back together and add fresh bedding - think I should dust it with pestene for good measure?


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PostPosted: Mon Nov 05, 2012 4:19 pm 
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Wise Wyandotte
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Well done! :thumbs:

I don't think there is any need to dust with Pestene. If you sprayed everything thoroughly there shouldn't be anything left that could be killed by Pestene. Just make sure to do the cleaning and spraying again in a week or so to kill mites that have hatched in the meantime before they start reproducing. They have a fairly short reproductive cycle.

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PostPosted: Mon Nov 05, 2012 4:28 pm 
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Dapper Duck
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Great, thanks for all the advice!


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