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Chemo-communication is an important mode of interaction within ecosystem. The living organism in the ecosystem can deliver signals to conspecifics, to co-organisms, and unintentionally to their enemies, by emitting the volatile organic compounds (VOCs) to the atmosphere. There are some insect-fungi-associations displaying interesting relationships. For example, some bark beetle species (PAINE et al. 1997) introduce fungi into the conifers during the attack process. Fungi take advantage by associating with the insect in transport to new trees and passage through the bark. Insects may get advantage by feeding on fungi and overcoming the tree defence. Questions arise how fungus vectoring insects can recognize the weakness of defense mechanism in the case to introduce the fungus to the host tree and successfully overcome the remaining defence mechanisms. The interspecific communication among insects, fungi and host trees are not completely clarified, but there was the evidence that a number of forest scolytids including species in the genera Scolytus, Dendroctonus, Hylurgops, Trypodendron and Tomicus can be attracted to the host volatile compounds (BYERS 1995).