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I was wondering if its possible to catch spiders and place them in my greenhouse in order to kill unwanted insect that feast on my plants? I don't really mind presence of spiders since then are not dangerous in my country (Czech republic).

Common species that live outside are Araneus diadematus, we got many that live in presence of human like Tegenaria domestica, but I read that they are type that live at human build constructions and can't really survive outside.

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What you describe is called biological pest control. Lacewings and earwigs are more common, but there are ways to use spiders.

http://unossc1.undp.org/GSSDAcademy/SIE/Docs/Vol4/Rearing_spiders.pdf

http://www.annualreviews.org/doi/abs/10.1146/annurev.en.29.010184.001503?journalCode=ento

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