**5. Conclusions**

The microbial communities of the rhizosphere and phyllosphere are essential to the health of their hosts. Researchers are currently seeking to understand the active role of tree-associated microorganisms and the mechanisms related to the

*Perspective Chapter: Microorganisms and Their Relationship with Tree Health DOI: http://dx.doi.org/10.5772/intechopen.110461*

recruitment of beneficial taxa. Knowledge about tree-associated microorganisms is increasingly more important in the face of the current scenario of increasing diseases of forest declines. Therefore, microbial ecology studies applied to tree-associated bacteria and fungi communities will enable researchers to bioprospect new microorganisms for use in plant growth promotion and disease control.
