The studies were conducted to determine the effect of tea tree oil on in vitro mycelium growth of some Trichoderma isolates. Seven isolates of T. harzianum (Th1) and seven isolates of T. atroviride (Th3) were tested. The growth of Trichoderma isolates was studied on PDA media with tea tree oil at the concentration of: 0.05; 0.1; 0.2 and 0.3%. The studies proved that the applied tea tree oil was effective in mycelium growth inhibition of T. harzianum and T. atroviride at the concentration of 0.2 and 0.3%.
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