One beetle is a very serious pest of black locust, while one mote is a serious pest of citrus. There are two basic kinds of life cycles in insects. Molt the process in which an immature insect casts its skin in order to grow. N Natural enemy A predator , parasite , parasitoid or pathogen . Nematode Many families of long, legless, worm-shaped animals, including tens of thousands of species worldwide.
Some species are aquatic, in freshwater or the sea.
Some species are parasites of birds, mammals, or other vertebrate animals. Some species are parasitoids of insects. Others feed on plant roots. Nymph One of the phases in the life cycle of some insects, such as thrips. Insect nymphs look quite similar to the adults, but are small and lack wings.