Galls, the plant tumours have been known since mythical and biblical times. Yet, it was not until the turn of the last century and the early twentieth century, that their classification ecology and relationship with the animal kingdom have been established. Even today the physiology and biochemistry of tumor induction seems to puzzle scientists. Galls are neoplastic growths resulting from the reactions of plant species to various kinds of stimuli. Diverse species of insects which infect plant tissues to spend a part of their life cycle cause gall formation. Gall morphogenesis is the result of interaction between morphogenetic control of the plant body and the insect factor (Miles, 1968). Thus, the galls are unique examples of complex interactions and mutual adaptation between the host and pathogen caused by cellular hypertrophy and hyperplasy.