Mycorrhiza represents a symbiotic association between the roots of plants and fungi, the phenomenon is so universal that a non-mycorrhizal plant is considered an exception. Apart from Fungi, bacteria also live in symbiotic association with roots of leguminous plants by forming root nodules. These convert nitrogen gas into a form that plants can use. These are commanly known as plant growth promoting rhizobacteria (PGPR). Due to increasing awareness for environmental quality and chemical free agriculture, the use of PGPR is attracting worldwide attention. Numerous Fungi and bacteria are utilized as " biocontrol" agents for plant disease management by exploiting their antagonistic potential. Microorganisms are being utilized as food or in the production of food. Various types of yeast are being used for the production of bread,cheese and beer. Many fruit bodies of fungi (mushrooms) are delicious and rich in nutrient content and some also possess considerable medicinal value. Some of these are being cultivated on a commercial scale as well. This overview highlights different roles of microbes play in forestry.