Praying Mantis the Pest Police:
Organic gardeners who avoid pesticides may encourage
mantises as a form of biological pest control. During fall
in temperate regions, mantis females typically deposit a
cacoon on the underside of a leaf or on a twig, and in some
species these are harvested commercially. If the egg case
survives winter, the offspring, called nymphs, emerge in
late spring or early summer. The nymphs have voracious
appetites and typically cannibalize each other if they
cannot find an adequate supply of aphids and other small
insects. Tens of thousands of mantis egg cases are sold each
year in some garden stores for this purpose. However,
mantises prey on neutral and beneficial insects as well,
basically eating anything they can successfully capture and
devour.
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