The pieces of bark were pre-treated by dipping them in a suspension of T. atroviride SC1 conidia in SDWsolution (3 107 conidia mL1) for 1 min. The other (control) pieces of bark were dipped in SDWfor the same amount of
time. The pieces of barks were then placed in Petri dishes (90 mmdiameter, one piece per plate) containing agar technical (Oxoid;Basingstoke, UK, 20 g/L) to maintain a good level of humidity