What insecticide kills spiders but not praying mantises?
No insecticide kills spiders and spares praying mantises.
Spiders number among the world's arachnids, along with mites,
scorpions and ticks, whereas praying mantises, as insects, may be
as vulnerable as arachnids even to such botanical insecticides as
nicotine sulfate and pyrethrum. Spider control by botanical or
chemical means requires a product that is categorized as an
acaricide or as an arachnicide.