Answer: Wasps are beneficial insects so leave the nests alone if you can. In the late fall you can remove the protectors from the trees and shake out the empty wasp nests, if you don't want them there. If your trees are dying, it'ts probably not a resultof a wasps nest being there, but some other problem. It would be best not to use Raid, as the petroleum distillates in the product could injure the tree bark. How about trying just a strong stream of water from the hose, directed at the nest, to dislodgeand destroy it?
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