St Louis Pest Control Blog

How to Treat a Yellow Jacket Nest

As St. Louis is now in the dog days of summer, stinging insects are going to become much more of a nuisance.  Proper treatment techniques can make the difference between getting stung and getting away un-harmed.  If you choose to do it yourself vs. hiring a professional pest control company, here are some tips to follow.

Yellow Jacket wasps are a very aggressive social insect.  They will swarm and sting anything that comes into direct contact with their nesting site.  They have even been known to attack if you just happened to walk within a few feet in some cases.  This reminds me of when I was a child, my younger brother happened to be playing near a ground nest when he was attacked out of no where.  I remember my mom taking him into the bathroom to help him out because a few wasps had flown directly up his pant leg as he accidentally stood above the  nest.  It has been over 30 years since this had occurred but me and brother (and my mom) still remember this day well. Needless to say, we are not huge fans of Yellow Jackets.

So, what is the best way to control Yellow Jackets once they have secured a nest site?  You must make a direct application into the nest and then wait it out.  This may sound like a disastrous plan, but it is very effective.  Now with that being said, you just can’t walk up to a nest treat without having the proper pesticide formulation or without having looked at the situation from about 10-15′ out.  Before you make the application you want to make sure there is only one exit/entry hole (sometime there are two and knowing where the second one is will help prevent someone from getting stung) and you want to identify the wasps’ flight pattern into the nest.  Knowing their flight patterns will allow you to approach the nest without getting attacked.  If you break this flight pattern close to the nest the wasps can attack you. Then the next step is to make a direct application of the pesticide into the nest.  If you do not get the dust directly into the nest the results may vary.

The best pesticide to use for this treatment is Delta dust, in my opinion.  Delta dust has an excellent formulation that allows the dust to flow down into the ground nest or into any other type of void nest effectively.  The dust can be applied straight from the container but for best results I would use a hand or bulb duster for better control and flow.  If you do not feel comfortable treating the nest during the day while the wasps are active you can treat the nest after dusk or before dawn.  The wasps are less active at this time.  Once the nest has been treated, retreat and stay away from this area until the next day.  You will find wasp hovering around the entrance reluctant to go into their nest because of the presence of the dust. They will eventually go back in though and pick up a lethal dose.  Within 2-3 days, the entire colony should be dead.  If for some reason you still have activity after 5 days has passed there is good chance the initial dusting was not done properly and treatment must be done again.

delta dust

Please call us if you have any questions or concerns regarding these pests at 636-343-7900 or go to for more information regarding our service options.


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