Used to trouble, harm an enemy they can be sprinkled around an enemies home to cause hard luck and trouble, if thrown into your enemy’s yard or property it will jinx them, mess them up, trouble them, defeat them, cause them confusion and bad luck.
Curses that involve pain and fear – Any curse that has pain or fear as a major component of its magic (either because it’s what you want to cause, or it’s what you want to get justice for) would be greatly enhanced by the addition of dried and crushed wasps or hornets.
Curses that involve falling afoul of spies, infiltrators, or deceivers – Wasps and hornets are most infamous in apiculture (beekeeping) for their tendency to enter into a beehive and kill every single bee inside, completely destroying a colony in a matter of hours or days. They do this by camouflaging their scent, and then sneaking into the hive round a back entrance. Once inside, they will kill everything in their path to achieve their goals. Any spell that involves either retribution for those that have done this, or hope to invite these kinds of people into someone’s life, would do well to have crushed or whole hornet or wasp nest in them.
Curses that involve projects or structures going wrong – Wasps and hornets are also well known for causing colony collapses. Using dried and crushed hornets and wasps in your spellwork can be very effective in causing organisations, projects, or communities to break apart, or again to get retribution against those who performed these actions. Most effective against organisations with power that’s highly consolidated in one person, like in a beehive.
Any spell focused around matriarchal or feminine-specific social structures – Using wasp or hornet nest in your spell can (if you properly cleanse it with salt and smoke to remove negative inclinations) help boost spells that are focused around matriarchal social orders. This is also true with ant nest and honeycomb pieces, though honeycomb is the best of the options.
Any spell focused on people who leech things off of others – Hornets and wasps don’t work for their food like bees or ants do, but prefer to target those who work hard and steal or leech off of them. Any spell that’s aimed at human leeches, mooches and other human parasites can be increase with the addition of crushed wasps and hornets. Parasitic creatures like actual leeches, mosquitoes and ticks are better, but less readily obtainable in some areas.
Excerpts taken from The Use of Hornets and Wasps in Witchcraft by Ms. Juniper Wildwalk