We have very aggressive wasps who have built multiple nests between the walls of a plastic children’s playhouse in our backyard. They also built inside a baby swing in the hole where the rope holds swing. We have sprayed and sprayed but they either don’t die or come back. We have used “Hot Shot wasp & hornet spray” with Prallethrin & lambda cyhalothrin. Do we need to throw out the toys? The wasps seem to be all over this year (northern lower Michigan) and AGGRESSIVE. Any help appreciated. Two grandkids & husband have been stung so far.
You’ll need to upgrade to the professional strength products we have featured in our WASP CONTROL ARTICLE if you want to get kill the ones that are there right now and keep new ones away for any length of time. The product you mentioned is a “ready to use” type of spray and not designed nor capable of lasting long so it won’t leave a residual that’s strong enough. Additionally, there are some species of wasps that it just won’t kill quick enough which can lead to bad results.
To avoid these issues, get some of the CYPERMETHRIN you’ll see listed in our article. It’s very strong and wasps simply don’t like it. They’ll avoid treated surfaces and treatments can last 3-6 weeks.
Additionally, if you see them entering cracks and/or crevices where there might be a space they’re using for nests, get some of the DRIONE DUST and puff it into these spaces. It’s very active on all wasps and bees and will no doubt work the best for these locations.
Here are direct links to the information and products listed above:
Wasp Control Article: http://www.wasps.net/wasp-and-hornet-control