Selection of <i>Grifola frondosa</i> and <i>Fomitopsis pinicola</i> strains resistant to <i>Trichoderma viride</i> in teflon tubes confrontation method

The aim of this study was to select fast growing strains able to resist <i>Trichoderma viride</i> in a short-time experiment to be realized with a concurrently performed fruiting experiment. The test was realized in Teflon® tubes. Five strains of <i>Grifola frondosa</i> (Dicks: Fr.) Gray and five strains of <i>Fomitopsis pinicola</i> (Swartz: Fr.) Karst. were used as test organisms. Different factors that can influencing substrate invasion rate and resistance to <i>T. viride</i> were analyzed: substrate composition, quantity of substrate included in the tubes and colony size of the tested strain at the time of the inoculation of the pest. <br><br> Results sometimes showed great variations in behavior between strains, but also for a given strain growing on different substrates, indicating the importance of trophic factors in the resistance capacity. We also showed that substrate quantity and colony size can modify the capacity to resist. However there was no correlation between growth rate on agar-malt medium, substrate invasion rate, resistance to <i>T. viride</i> and fruiting capacity, showing the importance to test these different factors to select the best strains which can be further recombined.