It was primarily believed within Europe during the 18th century that insects were correlated with the devil, as anything not understood or relatively misunderstood during the period was explained as evil or demonic phenomena in nature powered by supernatural forces. Scientific knowledge was limited during the 18th century, therefore superstitious beliefs were commonplace throughout the whole of Europe. Europeans believed that insects spawned from the mud annually, because they could not explain why insects develop en masse and are only present for the warmer months of the year, with this hypothesis referred to as “spontaneous generation”. This theory was only laid to rest after the theory of spontaneous generation was challenged by several scientists including Italian physician Francesco Redi, who conducted experiments during the 17th century which demonstrated that maggots decaying upon meat arise from eggs laid by flies, not from the meat itself. During the 18th century, Italian priest and biologist Lazzaro Spallanzani conducted further experiments which refuted spontaneous generation, particularly for microorganisms
