I have used beneficial insects in the greenhouse twice. One was some purchased ladybugs, the other was praying mantis egg cases I relocated from the woods in my back yard.
Both were highly effective at eradicating pests. Both populations died out rapidly once that was effectively gone as a food source.
On a personal note, have you ever reacted when running into an unseen spider web? Just image what it's like when thousands of newly-hatched mantids jump on you all at once...
I do introduce beneficial microbes (Quantum-Total Plant Probiotics) into all of my plants on a regular basis.
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