We investigated whether neem extract and azadirachtin can reduce the amount of Trichoderma in therhizosphere. The rhizosphere soil of treated mung beans was used to conduct plate counts on Trichoderma-specific medium. We found that neem extract and azadirachtin treatments at any concentration significantly reduced the amount of T. asperellum in the rhizosphere (Figure 3). However, the root length, shoot length, root weight, and shoot weight of the treated mung beans in this study were not significantly different (data not shown). These results might imply that the colonization of mung bean roots by T. asperellum was reduced in treated plants.