Diversity of Trichoderma in greenhouse soil

The protected agricultural production has become one of the fast growing and wid espread cultivation technology in the north parts of China. Continuous cultivati on of single crop or less rotation of crops usually resulted in the large amount of accumulation of soilborne pathogens and serious crop diseases in the greenho use. After a few years of investigation of soilborne fungi in the north parts of China, nearly one hundred species of mictosporic fungi have been identified by the authors. Among these fungi 11 species of Trichoderma have been morphol ogically identified, namely T. atroviride, T. aureoviride, T. citrinoviride, T. fertile, T. harzianum, T. inhamatum,T. longibrachiatum, T. parceramosum, T. r eeseii, T. virens and T. viride. Trichoderm is found to be a frequently occurring genus of fungi in greenhouse soil. As an important component of effec tive beneficial antibiotic mycoparasites in soil Trichoderma plays an impo rtant part to regulate the balance of beneficial and harmful soilborne microorga nisms.