We have ground wasps all over our yard! We have been paying to have them killed every year and it is not working—I am going to do it myself now!!! What do you suggest we plug the holes with exactly?? Thanks.
If you read through our GROUND WASP CONTROL article, you’ll see there are a three main products to use. The first is the DELTAMETHRIN DUST. This can be directly applied to any active hole and will result in immediate control of the wasp or wasps living there. Within a day they’ll be dead.
The CYFLUTHRIN GRANULES are better suited for treating a large area and most definitely need to be used when you have a big infestation. However, they don’t work quickly. In fact, by themselves they might take 4-8 days to work so if you only use them, be sure to water them in for faster results and be patient. Also, be sure to treat every 30 days for at least 3 months to insure you get them all. We’ve seen attempts at using the granules alone mostly result in failed effort. To help counteract these failures, we suggest spraying over the top of the granules for long term results.
For this, the ESFENVALERATE works well. It will act quickly, like the dust and within 1-2 days most that have hatched will die.
Remember too, as our article explains, the pupae of these wasps will be hatching daily for the next 2-4 weeks so expect to see surges in populations even after you start treating. This is because nothing can kill the pupae so even after your treatment kills the ones active, new ones will hatch out following their death for awhile. This means you’ll be seeing “replacement wasps” till the cycle of the local population runs out. If you’ve done a good job of treating, in the end they won’t be able to continue their cycle since your effort should stop them. The key here is getting them early on, like now, when they first get active and then to remain on them while their hatching out.
Here are direct links to the information and products mentioned above:
Ground Wasp Article: http://www.bugspray.com/articles99/diggerwasps.html
Deltamethrin Dust: http://www.bugspray.com/catalog/products/page1268.html
Cyfluthrin Granules: http://www.bugspray.com/catalog/products/page1271.html