Based on many studies and experiments one can say that biologically and economically hymenopteran parasitoids are very important group of insects. Many part of economic entomologists do agree that parasitoids – along with other entomophagous organisms play crucial role in maintaining the homeostasis of biocenosis. An exact knowledge of this insect group may thus constitute a base for their applying also in more specific environments, like agrocenosis. The research on the role of parasitoid and their utilizing is not too popular, in comparison with the multiplicity of their species. So, in this paper there are shown some examples of effectiveness of some parasitoid species in reduction of some important pests occurring in fruit orchards and some others crops. In my own investigations conducted in 1981–1987 in the habitat of apple orchards, I recorded the occurrence of 206 parasitoid species of 21 families, whereas in habitats surroundings orchards 390 species of 19 families were found. So, without doubt parasitoids could play on important role in the integrated pest control.
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