Trichoderma species are widely used in agriculture as biopesticides. These fungi reproduce asexually by production of conidia and chlamydospores and in wild habitats by ascospores. Trichoderma species are well known for their production of enzymes called Cell Wall Degrading Enzymes (CWDEs). All living organisms are made up of genes that code for a protein which performs the particular function. Some genes that play an important role in the biocontrol process are known as the biocontrol genes. These genes send some signals which help in secretion of proteins and enzymes that degrade the plant pathogens. These biocontrol genes can be cloned in huge amounts and can be used on large scale for commercial production. Some Trichoderma genes are also helpful in providing resistance to the biotic and abiotic stresses such as heat, drought and salt .The major biocontrol processes include antibiosis, mycoparasitism and providing plant nutrition.