By comparing exploratory data and experimental data, it can be said that there is relation between the abundance of endophytic fungi and anti insect activity of fungi. Fungi having no different abundance between aphid-free and aphid-infested, such as Aspergillus flavus and Coniothyrium sp., have minor effect on the suppression of aphid population. On the contrary endophytic fungi with high dominance in aphid-free plant, have significant suppressing effect on aphid population, and inhibit some other aphid biological attributes i.e. fecundity, life cycle, body size, even though the inhibitory effect varied among species. Thus, the facts show that colonization of later groups of