Influence of contamination by Penicillium brevicompactum and Trichoderma harzianum during Lentinula edodes spawn run on fruiting in sawdust-based substrates

 Substrates with two kinds of supplements, raw and deoiled rice bran, were artificially infected with Penicillium brevicompactum or Trichoderma harzianum on days 0, 26, 61, and 90 after inoculation with Lentinula edodes. With P. brevicompactum infection, there was no significant difference in the yield and size of the fruit-bodies among either infected and uninfected substrates, raw and deoiled rice bran substrates, or days when the substrates were infected. However, the irregularly shaped fruit-bodies, which were commercially of low value, yielded greatly on raw rice bran substrates infected on days 0 and 26, whereas the substrates infected with T. harzianum on any day were covered with conidia and fatally damaged. Received: August 29, 2001 / Accepted: February 15, 2002