Term (pará = beside, sitos = fattened) for many types of insects, as well as from bacteria. mushrooms and virus who use, live on, or derive nutrients from various other insects or plants as host. Parasites are highly specialized animals. Their habitat is usually limited to a few host species, not infrequently, there is only one type of host. In viticulture, these are understood to mean, in particular, insects which use other insects or their larvae as hosts, eliminate them or at least inhibit them in their development and thus generally beneficials be valid.
Strictly speaking, however, it is necessary to differentiate into parasites - evolve on or in a host, where the host is usually not killed - and in parasitoids - these develop on or in a host, requiring only one host for their development while the host dies. The parasitoids include, for example, the parasitic wasps, The fungi include, among others, the biotrophic species (feeding on living cells of the host) more false and true mildew as well as the necrotrophic species (kill the host tissue before taking nutrients from it) Botrytis cinera to the parasites. See also below Vine enemies,