DIY 6.5 meter wasp aerosol extension (nest killer)-£10-Pics

23 May 2007
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United Kingdom
Found a wasp next in my attic yesterday. I use the space for storage (boarded out) so the wasps had to go.

I could see part of the nest from the ceiling hatch, but most of it was hidden behind a roof joist. I called Rentokil, and they said the nest killer spray might not work if I couldn’t get to the whole nest….so I should spray the external entrance with wasp spray (tetramethrin & permethrin). The nest entrance was at the top of my gable end wall (7 – 8m up). I didn’t fancy renting 9m ladders from HSS and going up there with a can of spray to end up falling off after a wasp attack, so I called the council.

£54 per visit; s*d that.

Given a can of wasp killer spray costs £1.50, I thought I’d have a go at making something to extend the reach. There are commercial kits in the USA, but they seem expensive (>100 USD), and anyway, they’re not sold over here.

<Dusts off toolbox and left over screws>





There are 3 sections of 2.4m timber, all overlapping slightly and screwed together (lengthwise). Three screws per join for rigidity. I used 2x4cm section (approx). Sturdy enough.

The top part is made into a ‘T’ section. This helped with standing the pole off from the wall (while resting on it), as keeping the nozzle 5cm or so from the target was very difficult if you just kept the pole floating about in mid air – too much flex in the pole. Simple solution, just rest the pole against the wall with a standoff and fire.

The bit that activates the aerosol nozzle is just another piece of timber fixed with a single screw at one end and a long bit of string at the other. Once the pole was in position, pulling on the string depressed the nozzle.
With all three sections screwed together, I’d say the total length was around 6.5m, but once leaning against the wall, you could grab hold of the pole and raise it up above head height (another 2m) if need be.

All you need to make this is a box of self tapping screws, a screwdriver, some timber and a ball of string. The whole project including the wasp spray came to less than £10. A bit Heath Robinson, but much cheaper than a pest control call out (£35 - £55), and repeat treatments cost £1.50 :).

Some things I learned:

1. Don’t stand directly below the area you’re spraying. If your target is the nest entrance, you’ll score some direct hits. Wasps will drop to the floor. Just stand a bit back.

2. Once I did the entrance, I could see the little blighters trying different entry points along the soffit – so I gave the entire soffit along the gable wall a good dose too.
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Nice I absoloutly love that!! I had them last year in loft next to my bedroom, had rentokill out there straight away, not going near them lol

Hope it works

Took 3 days I'd say for them all to go, but they have gone. Only took one can. I used half of the can on day one, and the rest on day two. By the end of day three the lot had gone.
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Took 3 days I'd say for them all to go, but they have gone. Only took one can. I used half of the can on day one, and the rest on day two. By the end of day three the lot had gone.
Your mad, but result!
I used a caulking gun designed for "large tubes". With a paper sleeve, the spray canister was free to travel up and down yet not fall out. The cap from the spray can, turned "up-side-down" acted as a stop above the nozzle. A rope taped to the pump handle was enough to activate the spray. After the nest was saturated, drop the pole and the quick release comes to rest at on your fingertips.
I like this idea and I will have to keep this in mind if I ever have a wasps nest :)
Thanks. As a follow-up, I left the intact carcus of a nest on the tree. Aside from looking "awesome" form the size, folk lore says it will prevent future bees from nesting near. The nest is completely inactive a day later, though I gave a follow-up spray today so any visiting bees will pick up the chemical. Searched the internet and cannot find reference to anyone else using a large-tubing caulking gun as the trigger !!! The squeeze and release mechanism worked much better then expected. Complete control.

What I like is once started, one ignores the trigger and can focus on steady and methodical application. After the quick release works like a charm to stop. In hindsight, I could have pulled the trigger myself and then inserted the spray tube inside with both hands on the pole.

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