Abstract   

The subject of this review paper is to explain in the light of literature review, that despite a defense system of host, how parasites manage to escape and develop to complete their life-cycle. When organism becomes endoparsitic, i.e. change their life style from tree living to living in another species, this has many consequences for both tile apprentice parasite as well as for the pot host. The parasite has to develop strategies to avoid the actions of its host’s internal defense system and for its energy supply it has to gain access to host resources