More and more people are trying to treat wasp nests in order to save money, I agree with this idea but in order to help you carry out a safe treatment I have complied the following advice.
DIY products do work if used in a correct manner. (Do not forget your running shoes if the treatment goes wrong).
DO NOT BLOCK UP THE ENTRANCE HOLE UNTIL YOU ARE SURE THE WASPS ARE ALL DEAD OR THEY WILL COME OUT ELSEWHERE AND COULD CAUSE MAJOR PROBLEMS.
Wasps use whatever nesting material is available, and normally will build their nests near to ready material such as wood from fence panels / garden furniture / sheds / trees etc and convert it into a paste that the wasps use to construct their nest.
Wasps do not swarm in the same fashion as honey bees. Wasps only swarm around the nest location when the nest is tampered with (under attack) such as when a nest is treated.
Early summer onwards into late autumn is when you will be able to easily tell if a nest is active. Take a few moments to watch the nest from a safe distance. If you can see wasps walking over the outside of the nest, then it's live. If you can see wasps arriving at a hole in the wall etc there is a likelihood of a live nest being behind the hole out of sight.
Wasps and Hornets will not re-
PLEASE NOTE: Wasps can be dangerous if you are allergic to the stings, anaphylactic shock from a sting can result in serious and potentially fatal swelling.
ALWAYS WEAR PROTECTIVE CLOTHING WHEN DEALING WITH WASP NESTS.
Here is some information and advice about wasps and how to control and eradicate wasp nests.
Dealing with wasp nests can be dangerous as they can sting multiple times, not just once, like a bee. Wasps will instinctively attack anyone that ventures too near to their nest, they usually have “sentry” wasps which act as guards near the entrance to the nest and these communicate with wasps that are within the nest, when danger appears.
Even after treatment wasps will be seen for a short while due to foraging wasps returning to the nest, which is one reason we leave a treated nest in situ so that returning wasps will enter the nest and be killed with the remaining chemical.
How to destroy a wasp nest safely
Firstly, make sure you have some protective clothing, particularly a mask if you are using dust/powder insecticide.
Stand a short from the nest and watch the nest to determine where the in and out flight path is, it is best not to stand near to either.
Most pest controllers will use a powder, this will kill the nest fairly quickly and have a long term residual effect, which will allow time to kill off any returning wasps to the nest.
Most of the DIY powders use a chemical called Permethrin, this is ok and will do the job required adequately, however caution must be used due to the wasps becoming excited before they die off, which is normally minutes after treating. However Professionals would normally use a chemical called Bendiocarb which has a less exciting effect on the wasps, and kills them quickly.
It is an idea to try to lightly cover the nest with whichever powder you have directly from the puffer pack. If the nest is in a hole in the wall or behind an air brick, dust from the puffer straight into the holes just once or twice then urgently vacate the area, (hence the running shoes).
Use a powder/dust to kill these wasps. You do not need any application equipment but you may have to make several attempts to eradicate a nest behind an air brick. This is because you cannot get enough wasp killer dust to stay in the entrance path for the wasps to pick up and carry into the wasp nest. Usually a few puffs at the end of each day for a few days will be more than sufficient to sort out the nest. Apply over the whole air brick (but into the holes not on the surface as it looks untidy) as the wasps will use other holes in the brick if you don't treat all the vent holes. Do it late at night if you are too scared to approach the wasps during the day, however, treatment during the day will be more likely to work rapidly. Even at night, there will be some guard wasps at the entrance to the wasp nest.
Wasps very often nest in the ground and these nests are very easy to deal with.
No equipment is required. Just puff the wasp killer dust from the puffer into the hole.
Only use a Wasp Nest Killer Foam Aerosol if you can see the whole nest, aim the foam into the open entrance hole normally located at the bottom of the nest and then cover as much of the nest as you can with the foam before promptly vacating the area. (No necessity to use all of the can in one visit normally).
Insect venoms are complex mixtures and they can produce allergic reactions of two types: respiratory obstruction or a condition known as anaphylactic shock syndrome. This causes vascular collapse – breathing becomes shallow, the pulse is almost undetectable, there is profuse sweating and the victim quickly loses consciousness.
Death from wasp stings is rapid, when compared to death from snake venom; 66%of susceptible victims die within one hour of being stung.
By the end of the summer, a beach ball sized nest may house over 20,000 wasps.
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