Powder products are an ideal way to kill wasps with a continued residul efect to combat any straglers that may be out and about.
The safest way to apply these products is to scatter around the area they are congregating so they pick up the powder on their legs and bodies and take it back to the nest. Caution should be taken to ensuse bee's are not contimanted.
Pest controllers will use powders in a high pressure duster as a preferred method of wasp control.
Organic powders pose no threat to pets and children.